Final answer:
Amphibians were the first vertebrates to live on land. They developed adaptations such as breathing air and limbs for movement.
Step-by-step explanation:
Amphibians were the first vertebrates to live on land. In order to adapt to life on land, they underwent various changes, including the ability to breathe air instead of water and the development of limbs for movement. These adaptations allowed them to survive and thrive in terrestrial habitats.