Question

A male and female gibbon that are similar in size are likely showing:

a. the lack of sexual dimorphism as the result of unequal access to resources within their environment.
b. the lack of sexual dimorphism due to the polygamous social structure in gibbons.
c. the lack of sexual dimorphism, which is not related to social structure in gibbons.
d. the lack of sexual dimorphism due to decreased competition for mates in a monogamous social structure.

Answer 1

The answer is "the lack of sexual dimorphism due to decreased competition for mates in a monogamous social structure".

Sexual dimorphism is the systematic distinction in shape between people of various sexes in similar species. For instance, in a few species, including numerous warm blooded creatures, the male is bigger than the female. In others, for example, a few arachnids, the female is bigger than the male.