Yes, researchers can pinpoint the fossil's age with greater accuracy. The igneous strata above and below the snail fossil can be examined to determine their exact ages. Scientists can use this absolute age to estimate the sedimentary rock's age between these layers and the fossil it contains.
What is fossil ?Fossils are the remains or signs of prehistoric life that have been preserved by the forces of nature. Shells, bones, exoskeletons, objects preserved in amber, petrified wood, coal, hair, oil, and DNA traces are a few examples of fossils. Another type of fossil is a skeletal structure.
Scientists use a clock of some kind to establish the time of formation of a rock or fossil in order to calculate its age. To date historic occurrences in the distant past, geologists frequently utilise radiometric dating techniques, which depend on the radioactive decay of specific elements like potassium and carbon.Learn more about Snail fossil here:
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what is the meaning of cell division
Answer:
mitosis and meiosis.
Explanation:
There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life.
What passes through the
electron transport chain
AND both photosystems
to create a usable form of
energy for plants?
A. oxygen
B. electrons this is answer
C. pigments
Electrons passes through the electron transport chain and both photosystems to create a usable form of energy for plants
The electron transport chain is a series of four protein complexes that couple redox reaction and creating an electrochemical gradient that lead to the creation of ATP in a complete system named oxidative phosphorylation and it occur in mitochondria in both cellular respiration and photosynthesis and energy in form of ATP is generated at both cellular respiration and photosynthesis and in cellular respiration energy is synthesized in the mitochondria when electron passes through series of complex composed of the protein called as electron transport chain and electron produced from splitting water passes photosystem
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Answer: Electrons
Explanation: The electron transport chain is a series of molecules that accept or donate electrons easily
Help please
Why is mRNA so important?
A. because without it, DNA would be unable
to relay information to the rest of the cell
B. because it is the only molecule that carries
genetic information
C. because without it, the cell membrane
would be unable to protect the cell from
attack
D. because it has digestive enzymes that
protect DNA from being attacked
Answer:
a
Explanation:
because without it, DNA would be unableto relay information to the rest of the cell
In fruit flies, brown bodies (B) are dominant to black bodies (b). Cross a black fruit fly with a heterozygous fruit fly. Determine the phenotypic and genotypic rations of their potential offsping
The possible phenotypes of heterozygous fruit flies with brown bodies (Bb) that are crossed with black bodies (bb) include both brown flies (genotype Bb) and black flies (genotype bb).
What is a Punnett square?The Punnett square is a diagram used in genetics to calculate the possible phenotypes and genotypes in offspring according to the cross, which in this case includes Bb x bb to generate Bb and bb offspring.
Therefore, with this data, we can see that the Punnett square can be used to calculate the phenotypes in the next generation through their genotypes.
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What could result if tryptophan cannot cross into the cell?
A decrease in tryptophan levels in the blood
A build-up of tryptophan levels in the blood
If tryptophan cannot cross into the cell, there will be a build-up of tryptophan levels in the blood (option B).
How do substances move into cells?Tryptophan is an essential amino acid having an indole side chain. It is present in many foods, especially chocolate, oats, bananas and milk.
Tryptophan is essential for normal growth and development and is the precursor of serotonin and niacin. This amino acid is carried by the blood and is absorbed by living cells for use.
However, in a case whereby tryptophan cannot cross into the cells, it becomes built-up in the blood and increase in concentration.
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Rats are endothermic (warm blooded) animals. Explain why the physiology of a perch (an exothermic or cold blooded animal) would not support the metabolic needs of a rat.
They can readily adjust to any maximum temperature, allowing them to survive there. Rats were toasty endothermic animals. As a result, a rat's physiological needs wouldn't be met by the physiology of perches.
Animals having cold blood are those that are unable to adjust their internal body temperature in response to environmental changes. They are unable to endure high temperatures. Reptiles, fish, and other cold-blooded creatures are examples.
Animals with warm blood were those that have the ability to control and maintain a consistent body temperature. They could readily adjust to just about any temperature range, allowing them to survive there. Rats were warm-blooded endothermic animals. As a result, a rat's physiological requirements would not be met by the physiology of such a perch (an exothermic as well as cold-blooded species).
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4 organelos celulares comparados con objetos cotidianos
Four cell organelles in living cells are: mitochondria, nucleus, ribosomes and endoplasmic reticulum.
What is meant by mitochondria, nucleus and ribosome?The mitochondria refers to that organelle found in the cytoplasm which is regarded as the power house of cells.
The nucleus is the organelle in the cell where all cellular activities are controlledThe ribosomes are the sites of protein synthesis.That being said, a cell is defined as the structural, functional and basic unit of life.
So therefore, it can be deduced from the task above that ribosomes and mitochondria are some of the few organelles in the cells of living organisms.
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What are two pieces of evidence that support the Big Bang theory
Explanation:
hubbles discovery in the 1920's of a relationship between galaxy's distance from Earth and its speed
&
the discovery in the 1960's of cosmic microwave background radiation
Question5
a) What is the primary way that muscle force is controlled?
b) Describe this phenomenon and explain how this relates to changes in muscle
circumference.
Question6:
Which of these two types of muscle contractions (Isotonic, Isometric) is used in the body to promote joint stability? Briefly explain your reasoning.
Answer:
Q5 a) he nervous system controls muscle force by varying both motor unit recruitment and rate coding.
b) The central nervous system can increase the strength of muscle contraction by the following: Increasing the number of active motor units (ie, spatial recruitment) Increasing the firing rate (firing frequency) at which individual motor units fire to optimize the summated tension generated (ie, temporal recruitment)
Q6) isometric contractions are active in maintaining posture and maintaining bone and joint stability.
What makes the rough ER
considered "rough"?
A. the ribosomes that are attached this
B. the presence of bacteria
C. the folds in the membrane
Option A. Because of the attached ribosomes, the rough ER is considered "rough."
When viewed through an electron microscope, the rough endoplasmic reticulum (RER) appears studded due to the ribosomes attached to its cytoplasmic surface.
The rough endoplasmic reticulum is primarily composed of sheets, which are a two-dimensional array of flattened sacs that span the cytoplasm. These membranes contain an important protein complex called the translocon, which is required for protein translation within the rough ER in addition to ribosomes.
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Answer:
a) the ribosomes that are attached
Explanation:
The ribosomes that are attached makes the rough ER considered "rough". This is also called as RER. Therefore, the option (a) is the correct answer.
A. vascular tissue
B. ground tissue
C. nervous tissue
D. dermal tissue
Which of the
following is NOT a
tissue you would
find in a plant?
C
Nervous tissue is not found in plant instead they have some different system to respond to stimuli.
Biologists are aware that there are additional ways to process information in addition to our neurological systems and those of other animals, including fish. Plants can react to stimuli despite not having neural systems. For instance, when an aphid bites a leaf, the plant responds by sending an electrical signal from leaf to leaf instructing it to begin defending itself.
However, it's crucial to remember that a plant does not necessarily feel pain when it reacts to injury.
Plants lack nociceptors, the particular receptor types that are hardwired to respond to pain, in contrast to humans and other animals. They naturally lack the brains essential to convert such sensations into actual experiences since they also lack brains.
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Which model accurately represents how DNA replication functions? Explain.
Answer: the semiconservative one
Explanation: it desribes how dna replication works
What characteristics of the lungs of infants and small children creates increased risk of respiratory disorders
Answer:
The internal diameter of the airways in a child is smaller. Any inflammation or obstruction may cause more severe distress. In general, pediatric airways are smaller, less rigid, and more prone to obstruction. Children also have higher respiratory rates than adults making them more susceptible to agents in the air.
Explanation:
The results in the table above show the percentage change in mass of the potato cylinders.
explain why the percentage change results are positive and negative.
The percentage change in the mass of the potato cylinders is both positive and negative because the concentrations of the sugar solutions differ.
OsmosisIn biology, osmosis refers to the movement of water molecules from regions of low solute concentrations or high water potentials to regions of high solute concentration or low water potential through a semi-permeable membrane.
Solutions with high solute concentrations as compared to the sap of cells are said to be hypertonic to the cells. The cells, will, therefore, lose water to hypertonic solutions.
Solutions with the same solute concentrations as cells are said to be isotonic to the cells. There is no net movement of water between such solutions and the cells.
Solutions with lower solute concentrations as compared to cells are said to be hypotonic to the cells. Such solutions lose water to the sap of the cells.
This is exactly what happened in the case of the solutions and the potato cylinders. Hypertonic sugar solutions will cause the potato cylinders to lose water and weigh less than their initial weights. This will return a negative percentage change in weight.
Hypotonic solutions, on the other hand, will cause the potato cylinders to gain water and weight more than their initial weights. This will return a positive percentage change in weight.
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which new gene formation does fit to ortholog type of homology in evolution?
Gene duplication is a new gene formation phenomenon that fits the ortholog type of homology in evolution.
What is homology in evolution?The expression homology in evolution makes reference to the emergence of similarities between two or more sequences due to a common origin, which may occur as a consequence of gene duplication and subsequent divergence of ortholog sequences in order to play different roles as genetic material in the cell of an organism.
Therefore, with this data, we can see that homology in evolution is caused by similarities due to a common ancestor and it may be due to gene duplication.
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The arctic fox is uniquely adapted to its environment with white fur for camouflage, a small nose and ears and warm coat to prevent heat loss and strong paws for running and hunting. Which statement best describes how the arctic fox population may have adapted « its environment over time?
A. Foxes were bred to meet human needs for white fur.
B. Foxes developed smaller ears and noses in response to their cold climate. They were able to survive and pass this trait on to their offspring.
C. Foxes changed their fur to white to hide from predators and disguise themselves from their prey. They were able to survive and pass this trait on to their offspring.
D. Variation existed in the traits of the fox population. Foxes with smaller ears and noses were able to stay warmer and were more likely to survive and reproduce to pass their genes on to offspring. Over time, the fox population showed a shift to smaller ears and noses.
Answer:
D. Variation existed in the traits of the fox population. Foxes with smaller ears and noses were able to stay warmer and were more likely to survive and reproduce to pass their genes on to offspring. Over time, the fox population showed a shift to smaller ears and noses.
Explanation:
Adaptation does not happen overnight, and humans didn't breed foxes to have white fur. Smaller ears and noses allow less exposure to the cold because of their smaller surface area, which prevents heat loss. Foxes with smaller noses and ears didn't die of hypothermia, which allowed them to survive and breed and pass their genes to their offspring.
Differentiate between the lysogenic and lytic cycles. (1 point)
Viral proteins are synthesized during the lysogenic cycle.
O The virus injects DNA into the host cell during the lysogenic cycle.
O The host cell is destroyed during the lytic cycle.
O The host cell copies its own DNA during the lytic cycle.
Differentiate between the lysogenic and lytic cycles The virus injects DNA into the host cell during the lysogenic cycle.
The lytic cycle includes the replica of viruses using a number cellular to fabricate greater viruses; the viruses then burst out of the cellular. The lysogenic cycle involves the incorporation of the viral genome into the host cellular genome, infecting it from inside.
Inside the lytic cycle, the viral genome does no longer comprise into the host genome. within the lysogenic cycle, the viral genome consists of into the host genome and stays there throughou The main difference among lytic cycle and lysogenic cycle is that lytic cycle destroys the host cell while lysogenic cycle does no longer spoil the host mobile
The primary difference between lytic cycle and lysogenic cycle is that lytic cycle destroys the host cell whereas lysogenic cycle does not destroy the host cell. Viral DNA destroys the host cell DNA and arrests the cellular features within the lytic cycle. but, in the lysogenic cycle, viral DNA may merge with the host.
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If you go to the dermatologist and he or she removes a mole, what do you think is done with that tissue sample?
A doctor uses a circular tool to remove a small core of skin, including deeper layers (epidermis, dermis and superficial fat). Excisional biopsy. A doctor uses a small knife (scalpel) to remove an entire lump or an area of abnormal skin, including a portion of normal skin down to or through the fatty layer of skin. The mole is removed in a procedure under local anaesthetic. You will be given a local anaesthetic by injection at the place on your body where the biopsy will be taken from. The local anaesthetic may sting a little when it is injected, however, the skin will then go numb and the operation should be pain-free.
Explanation:Surgical excision:The dermatologist cuts out the entire mole and stitches the skin closed if necessary. Surgical shave: The dermatologist uses a surgical blade to remove the mole.Please help don’t understand
Answer:
I believe the answer is D
Explanation:
The progressive series of changes that eventually produce a climax community on what was once a bare lava flow is an example of
Answer: primary succession is the correct answer
examples and non examples of a electron
Answer:
[Example]
Electrons are the smallest of the particles that make up an atom, and they carry a negative charge. The number of protons and electrons is equal in a neutral atom. The hydrogen atom, for example, has just one electron and one proton. The uranium atom, on the other hand, has 92 protons, and therefore, 92 electrons.[Non examples]
Protons because a proton is positivelycharged & the electrons of negatively charged.How does the translation
process know where to
start and stop?
A. The ribosome decided when to
start and stop.
B. Start and stop codons this
C. It is random.
D. The genes regulate the entire
process.
Answer: B. Start and stop codons
Explanation:
The start codon marks the site at which translation into protein sequence begins, and the stop codon marks the site at which translation ends.
Answer:
b) Start and stop codons
Explanation:
The translation process know where to start and stop by Start and stop codons. Hence, the option (b) is correct.
If mitosis but not cytokinesis occurred in onion root tip cells, what would you expect to see on a slide of these root cells?
Answer: Well, cytokines happens after mitosis so you wouldn't see the daughter cells dividing yet.
Explanation: Onion root-tip cells divide once every 24 hours, or roughly two hours after sunrise, and go through a cell cycle that lasts for about 24 hours. Therefore, in order to harvest the greatest amount of proliferating cells, water-grown roots should only be removed at that time.
examples and non examples of a isotope
Answer:
carbon-12, carbon-13 and carbon-14
Explanation:
this three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.
In which type of cell do both DNA replication and cellular respiration take place in the cytosol?
- Animal cell
-Fungal cell
-Plant cell
-Bacterial cell
Both DNA replication and cellular respiration take place in the cytosol of a Bacterial cell.
What is a bacterial cell?
Small, single-celled organisms called bacteria exist. Nearly all areas of the world are home to bacteria, which are essential to its ecosystems. Some species can survive in environments with high pressure and temperatures. In fact, it's thought that there are more bacterial cells in the human body than there are human cells. Bacterial cells don't have a nuclear membrane therefore both DNA replication and cellular respiration take place in the cytosol. Hence, bacterial cells do both.
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Which is NOT a
characteristic of
saturated fats?
A. They are less healthy than
unsaturated fats.
B. They are gases at room
temperature. This
C. They are saturated with
hydrogen.
D. They are liquid at room
temperature.
Answer:
They are liquid at room
temperature.
Examples and non examples of nucleus
What do we call the cells in
phloem that are alive at
maturity, but lose almost all
of their organelles?
Tracheids
Sieve-tube this
Sieve elements are the phloem cells that are still alive when they reach adulthood but have essentially no organelles left.
Sieve elements are alive at maturity but lack some organelles, such as a nucleus, in comparison to tracheary elements, which have just primary cell walls (and consequently thicker overall cell walls).
Thin-walled cells called sieve elements typically don't have nuclei but are nonetheless alive at maturity despite having a significantly altered protoplast. .The primary walls of parenchyma cells are thin, and they typically continue to live after reaching maturity. The primary type of elongated photosynthate-conducting cell in vascular plants' phloem is known as a sieve element. Sieve regions, which are thinner, circular to elliptical portions of the wall, are present in the walls of sieve elements.
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Describe and list the contents of the dural sinuses, subdural space, and subarachnoid space.
(help needed asap. thank u so much) :)
PLEASE HELP WILL GIVE BRAINLIEST
Answer:
122+293
773
because you are you still
Answer:
Notothenioidei is one of 19 suborders of the order Perciformes. The group is found mainly in Antarctic and Subantarctic waters, with some species ranging north to southern Australia and southern South America.[2][3] Notothenioids constitute approximately 90% of the fish biomass in the continental shelf waters surrounding Antarctica.[4]
773 is answer
