They confirmed investigators theories about monkeys aggressive response to competition for food and water.
They confirmed investigators beliefs about the motivation for continued aggression among monkeys in the same social group.
They disproved investigators theory that the introduction of intruders in an organized monkey group elicits intragroup aggressive behavior.
They cast doubt on investigators theories that could account for observed patterns of aggression among monkeys.
20. The passage suggests that investigators of monkeys social behavior have been especially interested in aggressive behavior among monkeys because
aggression is the most common social behavior among monkeys
successful competition for incentives determines the social order in a monkey group
situations that elicit aggressive behavior can be studied in a laboratory
most monkeys are potentially aggressive, yet they live in social units that could not function without control of their aggressive impulses
most monkeys are social, yet they frequently respond to newcomers entering existing social units by attacking them
21. It can be inferred from the passage that the establishment and preservation of social order among a group of monkeys is essential in order to
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