Question

some species form social groups only with members of the same gender. for example, elephants form groups with only females and their offspring. once the male offspring reach a certain age, they leave the group and become solitary.
which is a benefit of this type of social group structure?
females do not have to compete for a mate
male offspring can belong to more than one social group.
adult males can mate with females in several different social groups.
females are the only ones responsible for taking care of the offspring

Explanation:

• Option 1: In a group with only females and their offspring, males leave. So females don't compete for a mate within the group as there are no adult males in the female - offspring group.
• Option 2: The text says male offspring leave the group when they reach a certain age. There is no indication that they can belong to more than one social group.
• Option 3: The text focuses on the structure of the female - offspring group and male offspring leaving. There is no information provided about adult males mating with females in several different social groups.
• Option 4: The statement “Females are the only ones responsible for taking care of the offspring” is a general statement about elephant behavior (if we assume the example is about elephants, but the question is about the benefit of the social - group structure. This option does not address the benefit of the social - group structure (same - gender group) but rather a general care - taking behavior.

Answer:

Females do not have to compete for a mate.