Valerie hypothesizes that frogs lay more eggs in warm water than in cold water. When Valerie designs her experiment, what should be the only variable that changes?

A.

frog species

B.

time of year

C.

water temperature

D.

water flow rates

What can you infer about a star that exhibits a red shift in its spectra?

Which region is directly medial to the hypochondriac regions of the body?

How do you think the air and the land were when Earth first formed?

Which example best illustrates the difference between a community and a population? A) The two terms are interchangeable, a population IS a community. B) All the people in a town would be a community; all their cattle would be a population.

What major organ would expect to find in the dorsal body cavity?

Rosa has a vegetable garden. She places earthworms, which are decomposers, in the garden soil. What is Rosa most likely trying to do? A. prevent insects from eating the plants B. create usable food energy for the plants C.

A transposable element (TE), or transposon, is a __ sequence that can change its __ within a genome, sometimes creating or reversing mutations and altering the cell's __.

How a biologist's reseach can proceed from an idea to a published article

How many times do the nostrils of a frog open and close in one minute

What regulates the enzymes present in an organism A. Phenotype B. Genotype C. Proteins D. Carbohydrates