Answer:
Social
Step-by-step explanation:
The behavior exhibited by the vervet monkey in response to the sighting of a snake is best described as "social." Social behavior refers to actions that are influenced by the presence or actions of others within a particular social group. In this case, the vervet monkey is alerting other members of its troop to the presence of danger by making a chittering sound, which is a form of social communication.
Moreover, the fact that the other monkeys responded by looking at the ground indicates that they also recognize the significance of the chittering sound and are appropriately responding to the warning. This behavior is an example of social learning, which refers to the acquisition of information from others within a social group through observation, imitation, or communication.
Overall, the behavior of the vervet monkey and the response of the other monkeys highlights the importance of social behavior and social learning in many animal species, including primates. These behaviors are critical for the survival and success of social groups, as they allow individuals to share information, coordinate activities, and respond to environmental threats.