Q: In birds, lightweight air-filled bones and a large four-chambered heart are examples of adaptations for what purpose?


Read this paragraph and choose the correct option from the provided answers:

Birds are endothermic tetrapod vertebrates. They are bipedal and have wings and feathers. Their organ systems are adapted for flight. For example, they have light-weight air-filled bones and a large four-chambered heart. Birds also have relatively large brains and a high level of intelligence.

 Choices:

- speed

- long lifespan

- mating

- flight


A:
flight