_____ is the biological theory which states that all living things have acquired their present forms through gradual changes in their genetic endowment over successive generations.
Evolution occurs via _____, the process by which the animals that are best adapted to their environment are more likely to survive, reproduce, and pass on their genes to the next generation.
Sociobiologists suggest that the characteristics used to judge a person's attractiveness, like their physique and complexion, are related to the person's _____.