Which type of scientific investigation involves testing variables that are manipulated, controlled, or measured in order to gather evidence to support or disprove your hypothesis?

Select one:
a. experimental
b. descriptive
c. contrasting
d. comparative

Chromosomes move to opposite poles during anaphase because microtubules shorten at the centrosome, pulling the chromosomes which are anchored to the other end.

Group of answer choices

True

False

A recessive allele is: hidden if present with a _____ allele; or visible if present with a _____ allele.
Group of answer choices

dominant, recessive

recessive, dominant

dominant, dominant

recessive, recessive

Somebody Helppp please

Heston took a walk in the forest. He noticed that most every tree was missing bark, limbs and leaves from the ground up to the height of an average deer. He also observed that the woods had a minimum amount of young small trees. THe forest grond had neglible amount of vegetation. As Heston walked through the woods, deer fooprints and droppings were commonly noticed. Heston also noticed that he did not observe the presence of bird's nest. AS Heston was leaving the woods, he saw four deer stripping bark off one of the last healty looking trees. What kind of inferences can Heston make based on his observations in the forest?

a
The deer population was scarce in the forest
b
The squirrel population was common in the forest
c
The predator population was overpopulated in the forest
d
Deer population was above carrying capacity in the forest

Help please this is due soon so I need someone’s help

Which of these situation would tend to cause absorption of the largest amount of solar energy
A.Sunlight striking red desert soil in western africa
B..Sunlight striking sea ice near Greenland
C..Sunlight striking brown forest soil in southern russia
D..Sunlight striking the North Atlantic Ocean
APEX

The study of energy and the work being done in systems such as an ecosystem is called​

What percentage, on average, of living plant biomass on land is consumed alive by herbivores?a. More than 75% b. 50% c. 25% d. Less than 10%

The cell in the diagram is part of what sort of tissue?

which sentence is an example of how a scientist might use a model?

The human body contains about 5 liters of blood. The liquid portion of the blood is called ____________________________________________and makes up about 55% of the blood volume. The rest of the blood is made up of the formed elements

George is a healthy 28-year-old man. He enjoys an active lifestyle, including playing on an intramural Ultimate Frisbee team. Last weekend, while at a meet, George got a cut on his leg, just above the knee. It wasn’t very deep, and he cleaned the wound thoroughly when he got home. A few days later, the cut didn’t seem to be healing as George would have expected. It was a little sore, and he was worried that it might have been infected, so he decided to go his local outpatient clinic to have it examined. At the clinic, Dr. Smith examines the wound. He tells George that it looks like it might be infected, so he prescribes a broad-spectrum antibiotic, tells George to keep the wound clean, and sends him home. Over the next week, George becomes concerned when the wound doesn’t get any better—in fact, it starts to get worse. The affected area has become larger, and it is sorer than it was earlier.

Required:
What do you think is responsible for the infection knowing that antibiotics have been used?

What are 3 major differences between prokaryotic and eukaryotic cells?

Fruits ripen due to an enzyme converting starch into sugar. Keeping fruits
in the refrigerator slows this process. Which sentence explains why?
Enzymes are solar-powered, they
convert light energy into chemical
energy, which they hand down to
their substrate. The refrigerator is
dark once the doors are closed the
enzymes won't get enough energy.
The enzyme converting starch into
sugar catalyzes the reaction at 20°C
(room temperature) and the reaction
rate decreases at lower
temperatures.
The enzyme converting starch into
sugar switches substrates at lower
temperatures and then starts
catalyzing another unrelated
substrate.
The reaction rate is constant
regardless of the temperature, but
the concentration of starch decreases
at lower temperatures.

refer to the figure below to answer the following question layer j is deposited on a _______?​

The correct order of stages of cellular respiration is
(a) glycolysis - the Calvin cycle - electron transport.
(b) the light reactions - glycolysis - the Krebs cycle.
(c) glycolysis - the Krebs cycle - electron transport.
(d) electron transport - glycolysis - the Krebs cycle.

23. Macromolecules containing large amounts of hydroxyl groups (-OH) have less potential energy than molecules that are largely hydrocarbons, which of the following best explains why?
a) Carbon – Hydrogen bonds are short and very strong
b) Carbon – Hydrogen bonds are long and comparatively weak
c) Oxygen – Hydrogen bonds are long and comparatively weak
d) Hydroxyl groups are easily removed in enzyme-catalyzed reactions

plz help asap..Consider this statement: Earth is the only source of gravity in the solar system. Do you agree? Give your reasons.

What are the main differences between plant and animal cells?

A. plant cells are eukaryotes and animal cells are not.

B. Animal cells are eukaryotes and plant cells are not.

C. Plant cells have cell walls and chloroplasts, animal cells do not.

D. Animal cells have cell walls and chloroplasts, plant cells do not.

In 1937, a man employed to lay water pipes was found to be the source of a severe epidemic of typhoid fever. The man, an asymptomatic carrier of Salmonella enterica serotype Typhi, the bacterium that causes typhoid, habitually urinated at his job site. In the process, he contaminated the town’s water supply with bacteria from his bladder. Over 300 cases of typhoid fever developed, and 43 people died before the man was identified as the carrier.

Given that antibiotics were not generally available in 1937, how could health officials end the epidemic, short of removing the man from the job site?

pleaseee help me its due today

what is referred to as the ocean desert because few life exist there

what type of circulation is described by the blood through thee tissues of the heart​

where does carbohydrate production occur in a chloroplast?

A. in the cytosol
B. in the stroma
C. in mitochondria
D. in the thylakoid

BIOLOGY HELP!! which match the correct choices having hard time understanding

A 17-year old girl was admitted to the hospital with a 1-week history of fever, chills, malaise, sore throat, skin rash, and polyarthralgia. She reported being sexually active and has a 5-week history of a profuse yellowish vaginal discharge, which was untreated. Upon presentation, she had erythematosus maculopapular skin lesions over her forearm, thigh and ankle, and her metacarpophalangeal joint, wrist, knee, ankle, and midtarsal joints were acutely inflamed. She had an elevated leukocyte count and sedimentation rate. Cultures of her cervix were positive for N. gonorrhoeae, but blood specimens, exudates for the skin lesions, and synovial fluid were all sterile.

Why were the synovial fluid cultures negative?

a. This organism cannot be cultured on artificial media

b. The arthritis is a non-suppurative sequala

c. The organism is difficult to recover from synovial fluid beyond the first few days of inflammation.

d. It should have grown. The lab made a critical mistake.

e. It should have grown. The nurse mislabeled the sample.

Which does NOT affect a molecules ability to cross a cell membrane?


A. Polarity of the molecule

B. Concentration inside and outside the cell

C. Energy of the cell




PLEASE HELPP

Which of the following is true about pure substance?

Question 1 of 10 Which expressions give the monthly pay of an employee with 42 hours of training? O A. 42 x pay or 42 xp B. 42(pay) or 42(p) O C. Hours(42) or H(42) O D. Pay(42) or P(42)​

Do you know what."prey" waits for it's own slaughter?​