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?
a. tetrapod locomotion
b. hearts with more than two chambers
c. lungs
d. amniotic eggs
e. All of these are essential for a completely terrestrial existence.

option D

amniotic eggs is a characteristic only of truly terrestrial animals with no need to return to water at any stage of the life cycle

Explanation:

Embryos are enclosed by a collection of fluid-filled membranes named the amnion. The fluid inside the amnion denominated amniotic fluid. Eggs that include an amnion to preserve the embryo are committed to as amniotic eggs.

The development of amniotic membranes suggested that the embryos of amniotes were equipped with their aquatic habitat, which commenced to more limited subordination on water for growing and thus conceded the amniotes to part out into drier conditions. This was a notable improvement that discovered them from amphibians, which were bound to moist situations due their shell-less eggs.

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