Question

Animals conduct certain behaviors in mating. Some practice _____, in which one male breeds with only one female, and others practice _____, in which one male breeds with multiple females.

Answer 1

The answer is monogamy and polygyny.

Both terms have a Greek origin. By knowing their origin, it is easy to understand the terms.
Monogamy literally means one marriage, from the Greek monos - one, alone, and gamos - marriage. So, in monogamy, one male breeds with only one female.
Polygyny literally means many wives, from the Greek poly - many, and gyny - wife, woman. So, in polygyny, one male breeds with multiple females.