Read this paragraph and answer the question below.
Together We Can Do More
Researchers have tried to explain how cooperative behavior evolves in human and animal populations. Penguins are a good example of this behavior. They live in extremely cold environments, where temperatures can reach -76°F (-60°C). To escape the wind and stay warm, penguins stand together to protect their eggs and survive the cold. Each penguin takes turns getting warm by spending time near the warm center of the circle. After they have warmed up a bit, they will move from the center to the edge of the group so that others can enjoy protection from the wind.
(Adapted from http://animals.nationalgeographic.com/animals/birds/emperor-penguin.html)
Cooperative means working together to achieve common goals. According to this paragraph, which common goals could explain the penguins' cooperative behavior? Choose 2 correct answers.
