The answer to your question is A or true.
Yes it is, an example is a group of animals not treated with it died, but the animals that were survived--
Answer:
A) They form chemical bonds with other atoms
Explanation:
In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
Fermentation if oxygen is not present