Listed below are four adaptations of terrestrial vertebrates. which is a characteristic only of truly terrestrial animals with no need to return to water at any stage of the life cycle?
1. tetrapod locomotion
2. hearts with more than two chambers
3. lungs
4. amniotic eggs
5. all of these are essential for a completely terrestrial existence

Amniotic eggs

Explanation:

Amniotes are the characteristic feature of tetrapod vertebrates comprising the birds, mammals and reptiles. The amniotes lay their eggs on the land and retain the fertilized egg inside the mother.

They are differentiated from the from the organism which lay eggs in water. Anamniotes are the organism which are specialized to live in water and they cannot survive on land.

Hence, the correct answer is Option 4

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