Explanation:A special case of polar forces occurs in what is called the hydrogen bond. In many situations, when hydrogen forms a covalent bond with another atom , electrons move toward that atom, and the hydrogen acquires a slight positive charge. The hydrogen, in turn, attracts another atom, thereby forming a kind of bridge between the two.
i think
Answer:
nitrogen base
Explanation:
as it is nitrogen that is fixed to make protein bonds
In DNA, each base pairs up with only
one other base
Answer:
1.—The (more) variations in forms it can produce.
2.—Biologists often need to search for evidence (in the distant past).
3.—By revealing the forms of (extinct species).
4.— (Intermediate) fossils can help biologists.....
A) weapons for an evolutionary arms race w/ disease causing organisms
