Answer: alkali metals and halogens
Explanation:
The two groups of elements in the periodic table those are the most reactive are alkali metals and halogens. The correct option is C.
What is periodic table?The periodic table (also known as the periodic table of elements) is organized so that scientists can quickly determine individual element properties such as mass, electron number, electron configuration, and unique chemical properties.
Non-metallic elements in the periodic table include hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium.
Metals are minerals found underground in rocks, such as iron or lead. Heat is used to separate these from the rocks. Metals are extremely useful.
The periodic table is significant because it is organized to provide a wealth of information about elements and how they relate to one another in a single, easily accessible reference.
The table can be used to predict the properties of elements, including those yet to be discovered.
Considering their valence electrons, the alkali metals and halogens are the two most reactive groups of elements.
Thus, the correct option is C.
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Which book asserted that due to the expanding human population, the ecosystem will collapse by the middle of the twenty-first century?
Answer: Hello There!............
Dennis Meadow's, the limits to growth, asserted that due to the expanding human population, the ecosystem will collapse by the middle of the twenty-first century.
Explanation:
Mark me brainest please. Hope this helps. Anna ♥
Pablo and Johanna must complete a yearlong study for their biology course. After some discussion, they decide to compare dog diets. To test their hypothesis that the local veterinarian's special dog food mix will enhance growth and development, each student adopts a puppy from the local pound. Pablo plans to feed his goldendoodle the special diet, while Johanna plans to use generic dry kibble from the supermarket for her bulldog. Pablo and Johanna have too many ________.
Pablo and Johanna have too many independent variables.
In order to conduct an experiment, 3 kinds of variables are used. These are:
Dependent variable Independent variable Control variableA dependent variable is a variable that the experiment seeks to observe and measure, this variable is expected to change in value throughout the experiment and depends on other variables. An independent variable is one that the researcher changes throughout the experiment in order to see what effect it will have on the dependent variable. Finally, the control variable is the variable that remains the same throughout the experiment in order to limit the influence they will have on the outcome. If the value we wish to measure changes, the presence of control variables helps to narrow down and correctly credit the cause of this change, leading to a valid experiment.
In the situation given, Pablo and Johanna have too many independent variables. The dependent variables that Pablo and Johanna wish to measure are dog growth and development. The independent variable is the one they change in order to see what effect it will have on the dependent variable, in this case, the dog food. However, the experiment would not be valid because the breed of dog should be a control variable to ensure correct data, given that different breeds of dogs grow and develop at varying rates. This variable is instead an independent variable in this given experiment, given that it changes between the two groups and will affect the outcome.
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Which biomolecule is the most diverse and has a variety of functions? *
carbohydrates
lipids
proteins
nucleic acids
Answer: Proteins
Explanation:
Proteins are one of the most plentiful naturally-grown molecules in living systems and possess the most distinctive extent of duties of all macromolecules. The purposes of proteins are highly distinct for 20, unlike chemically different amino acids that develop large chains, plus the amino acids can occur in any method. Proteins may be architectural, regulatory, contractile, or shielding; they may work in transportation, storage, or membranes; or they may be poisons or enzymes. An instance of the function of proteins: proteins can work as enzymes or hormones. Enzymes made by living cells are catalysts in biochemical reactions and are usually proteins.
PLS HELP URGENT NEED HELP RIGHT AWAY
Drag the tiles to the boxes to form correct pairs.
Match the scientific terms with their descriptions.
theory
law
fact
represents an observation
generally accepted to
be true
offers an explanation
for a phenomenon
defines a relationship
between a set of values
Answer:
the answer is actually- theory, fact, law
Explanation:
Got it right on edmentum!
According to the description the first description is the definition of theory, the second description is the definition of fact, and third description is the definition of law.
What is theory, fact, and law?
Theory is the representation of an observation generally accepted to be true. It is a system of ideas that explains something especially any general principles or hypothesis.
Fact offers an explanation for a phenomenon or a thing that is to be known or to be proved. It is an observation of a natural or social phenomenon which we can say directly or show it to others.
Law defines a relationship between a set of values or the system of rules which particular organization, country, or community recognizes and if somebody denies than the person would be punished or penalties will be imposed on that particular person.
Therefore, according to the description the first description is the definition of theory, the second description is the definition of fact, and third description is the definition of law.
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The picture above is an example of what type of tissue?
Answer: Epithelial Cell
Explanation:
The given picture above is an example of epithelial tissue. Option 3 is correct.
Epithelial tissue is a type of tissue that covers the outside of the body and lines the inside of organs and cavities. It is made up of tightly packed cells that form a continuous sheet. Epithelial tissue has many functions, including:
Protection: Epithelial tissue protects the body from harmful substances and pathogens.Secretion: Epithelial tissue secretes substances such as mucus, sweat, and tears.Absorption: Epithelial tissue absorbs nutrients and other substances from the environment.Excretion: Epithelial tissue excretes waste products from the body.There are four main types of epithelial tissue:
Simple squamous epithelium: This type of epithelium is made up of a single layer of flat cells. It is found in the lining of the blood vessels, lungs, and kidneys.
Simple cuboidal epithelium: This type of epithelium is made up of a single layer of cube-shaped cells. It is found in the lining of the kidney tubules and the small intestine.
Simple columnar epithelium: This type of epithelium is made up of a single layer of column-shaped cells. It is found in the lining of the stomach, intestines, and uterus.
Stratified squamous epithelium: This type of epithelium is made up of multiple layers of flat cells. It is found in the skin, the lining of the mouth, and the esophagus.
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Heloopplpopolll plz
Answer:
Options 2, 3 and 4
Explanation:
Options 2, 3 & 4 are also mentioned at tge end of the cycle; hence it means that a star can become a supernova, black hole or a neutron star at the end of its evolution.
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Identify an organism that is multicellular
Answer:
A Human is multicellular
Which of the following describes an ionic bond?
two atoms with positive charges attracting one another
two atoms with opposite charges attracting one another
two atoms sharing one or more valence electrons
two atoms that collectively have more neutrons than protons
Answer:
Second option I think
Explanation:
Answer:
2nd one im sure
Explanation:
their opposite
Someone plz help me :(
Answer:
I think it's A " The train must be able to complete the trip in six hours "
Answer:
I think the answer will be A
Explanation:
The train must be able to complete the trip in six hours
Hi i need help fast its biology where does nitrogen from the atmosphere go before it enters a plant
Answer:
The nitrogen goes through the roots of a plant.
Biodiversity means that all living things are the same. True or False
Answer:
False
Explanation:
Bio: life
Diversity: variety, differences
A.state two characteristics of the larval stage of a mosquito.
Answer:
Larva - (plural: larvae) "wriggler" lives in water; molts several times; most species surface to breathe air. Pupa - (plural: pupae) "tumbler" does not feed; stage just before emerging as adult. Adult - flies short time after emerging and after its body parts have hardened.
Why is it important for scientists to state a conclusion?
Answer:
I'd say a
Explanation:
A conclusion is just reiderating their points, not really proving reliability to other scientists. A conclusion wouldnt be to make an educated guess, either. it could possibly be c too, but i dont think concluding comments would be to explain exactly why it was performed, more like an end note and close to all their points. I'd go with a.
At the start of the lab, you will test known samples in order to see what positive and negative test results look
like.
Pre-Lab Question 4: Why is it important to know what a negative test result looks like?
I
Answer:
I feel it's to easily differentiate the positive from the negative...... like in gram staining of bacteria, the colour tell us which bacteria is gram positive or gram negative...... I just feel that this is science and it is advisable to know what the opposite result of an experiment should look like.
find 5 different fruits or veggeles to rest dense or less dense then water
Answer:
because. it is thekejejd
Mrs. Cruz has blood type A, while his husband Mr. Cruz has blood type B. Their first and second child is type A and type B respectively. What is/are the other blood type/s of their offspring?
Answer:
It may be AB
That is the possibility..
explain why oxygen and glucose need to be absorbed and waste products need to be removed
Explanation:
Oxygen and nutrients from food must be absorbed into the bloodstream to be delivered to cells for respiration. Waste materials such as carbon dioxide must be removed from cells into the bloodstream. Tissues contain capillary networks to allow these exchanges to occur at a cellular level.
Oxygen and glucose needs to be absorbed and waste products need to be removed for the proper functioning and maintenance of the body cells and systems.
Oxygen is an odor less and colourless gas that is needed by living organisms.
It is absorbed by living organisms because it serves as a source of fuel.
Glucose is a type of carbohydrate called monosaccharide which is gotten from food.
It is assimilated or absorbed into the body through the hormone insulin and serves as a source of energy.
Waste products of metabolism is removed from the body through the process of excretion. A typical example is the carbondioxide.
If Waste products are allowed to accumulate they cause poisoning which slows down vital chemical reactions.
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for the below image, label the 13.polar area and 14. non- polar area on the diagram
Answer:
LOOK AT THE ATTACHMENT
Explanation:
Is water an organic molecule? why or why not?
Answer:
Organic molecules associated with living organisms are also called biomolecules. Organic compounds are molecules that contain carbon atoms covalently bonded to hydrogen atoms (C-H bonds). ... Water (H2O) has no carbon; then, it is not an organic compound.
which is mostly studied by meteorologists plzz help :(
A. weather
B. Volcanoes
C. Rocks
D. Fossils
4. A(n) _____ is a logical interpretation based on prior knowledge or experience. a. inference b. observations c. hypothesis d. theory
Answer:Inference
Explaination;
A structure that is made up of different kinds of tissue is an?
Hi, the correct answer is:-
A structure that is made up of different kinds of tissue is an organ.
Some examples of organ are stomach, liver, heart etc.
Hope it helps you..
(Answered by Benjemin)
what is nonpoint source pollution?
A) pollutants that are found in deep water
B) pollution that comes from a source that can't be tied to a specific location
C) pollutants that are discharged from a specific location
D) pollution in the atmosphere that blocks the sun
Answer:
Pollution that comes from a source that can't be tied to a specific location.
Explanation:
In living organisms, complex chemical activities do what to substances?
A.
only build them up
B.
only break them down
C.
nothing
D.
build them up and break them down
Answer:
D. build them up and breaks them down
hope this will help :)
Answer:
D.Build them up and break them down.
What conclusion can you draw about the organisms you observed?Write and evidence-based claim
Answer:
Bacteria is very small to see so you need an micro scope to
see it
Explanation:
If you compared the skeleton of an adult horse to that of a newborn foal, what would you be studying?
Answer:
anatomy
Explanation:
fr fr fr fr fr fr.fr.fr fr fr fr fr fr fr f r f r r f r r f r r f d
Answer:
You would be studying:
Polysaccharides
Glucose and other, similar molecules, can be joined together to form polymers called polysaccharides.
Explanation:
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Even though they have several differences, a bacterium and a human cell will both contain DNA. With respect to evolution, what does this fact suggest?
Answer:
the fact that they both contain DNA in the nucleus of their cells, this suggests that they had a common ancestor they evolved from.
The fact that they both contain DNA in the nucleus of their cells, this suggests that they had a common ancestor they evolved from.
What are the features of DNA?Deoxyribonucleic acid is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the development, functioning, growth and reproduction.
DNA is a complex, long-chained molecule that contains the genetic blueprint for building and maintaining all living organisms. Found in nearly all cells, DNA carries the instructions needed to create proteins, specific molecules essential to the development and functioning of the body.
DNA contains the instructions needed for an organism to develop, survive and reproduce. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins.
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what name is given to bacteria that can cause an infection?
15. How many glycerol molecules are needed to form 1 molecule of an unsaturated
fat?
Answer:
One glycerol molecule is needed
Examine the following genetic sequences and determine which pair are the most similar based on their ED (evolutionary distances). Species 1 = ATTGGCCATT Species 2 = ATTCCGGTTT Species 3 = TTTGGCCATT Species 4 = ATTCCCCCCC Multiple Choice Most similar are: Species 1 = ATTGGCCATT Species 3 = TTTGGCCATT Most similar are Species 2 = ATTCCGGTTT Species 3 = TTTGGCCATT Most similar are Species 3 = TTTGGCCATT Species 4 = ATTCCCCCCC Most similar are Species 1 = ATTGGCCATT Species 4 = ATTCCCCCCC
Answer:
ATC-75/w
Explanation:
