What are the benefits and costs of living in a group. Explain and give an example.

Benefits: Defense from predators; reproduction. Costs: Competition for resources.

Explanation:

Animals that live in groups like gazelles benefit from the many eyes that are constantly watching for predators. Animals that live in large schools like marine fish can reproduce massively. But living in groups also has costs. Living together means that individuals have to compete for resources and for access to females.