Determine of the statement is true or false, and why. Nitrogen makes up most of the atmosphere, but is in an unusable form until converted into an organic form by bacteria. A. False, it should read, "Nitrogen makes up most of the atmosphere, and is easily converted into an organic form by plants."
B. False, it should read, "Nitrogen makes up a small percentage of the atmosphere, but comes in an easily usable form for most living organisms."
C. True.
D. False, it should read, "Nitrogen makes up most of the atmosphere, in a form easily accessible to plants, who convert for animals to use."

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.

Consider this plant cell which organelle is labeled g

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.