Answer:
your right!
Explanation:
i had something like this and i got a 100% on my exam the evolution issue was sometime in the 1990's.
I think it would be A. Because plants have bacteria on their roots that take the free nitrogen in the air from the soil and turn it into usable nitrogen. Animals could get usable nitrogen from eating plants since they have bacteria that make it. Then if an animal eats an animal that ate the plant, then it could get that nitrogen. But i am not completely sure though. I just learned this recently. I hope this helped :)
Answer:
Bat echolocation calls vary in their dominant frequency approximately between 11 kHz (e.g. Euderma maculatum; Fullard & Dawson 1997) and 212 kHz (Cloeotis percivali; Fenton & Bell 1981). Most insectivorous bats call with dominant frequencies between 20 kHz and 60 kH
Chemically straightening hair changes the shape of disulfide bonds, which alpha keratin protein; this is the second protein structure. However, as the hair continues to grow out, this keratin protein grows with it, thus outlasting the effects of the chemicals which change the shape of the protein.
Answer:
Rat and Squirrel are closely related.
Explanation:
Squirrel and rats are small mammals. Squirrel is a part of sciuridae family and order of rodentia. Rat also belong to there order rodentia. Squirrel are rodents like wise rats and share similar characteristics together. They have sharp teeth which continually grow,head shape and size and ear size.
