If the chemical touches another chemical, then there is a higher probability that it's going to react.
The animal’s anatomy is specifically evolved in and thus tied in with it physiology, thus affecting its interactions with the environment.
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.
The statement that is true about Enzymes is that A) They are used up in the reactions they catalyse.