Question

fill in the blank question
having a denser skeleton to withstand the force of gravity, a three - chambered heart, more acute vision, and lungs were all features that evolved in the
and allowed them to live part of their life on land, although they are still tied to water for reproduction.
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Explanation:

Amphibians have a denser skeleton to withstand gravity, a three - chambered heart, more acute vision, and lungs. They can live part of their life on land but are still tied to water for reproduction.

Answer:

amphibians