Question

Evolution of cleidoic egg and its structural and physiological adaptations

Answer 1

The significance of the cleidoic egg is that it enables reproduction out of, and often away from, water. Cleidoic eggs must have evolved in the early or middle Carboniferous, after the early tetrapods evolved, but before the amniotes split into sauropsids (reptile ancestors) and synapsids (mammal ancestors).

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Answer 2

ANSWER:

Evolution of cleidoic egg must have been in a very early stage like before the evolution of mammals and at the age of reptiles.

EXPLANATION:

The cleidoic eggs are the type of egg which is laid by the reptiles. Its other name is amniotic egg.  

Structural adaptations:

• It is colored and its size is small as compared to other eggs.
• As a normal egg, it has eggshell, an outer and inner shell, albumin, nucleus, etc.
• It also has an air shell and yolk.  

Physiological adaptations

• They are laid away from water where it can adopt the feature.
• These type of eggs conations all the food, water and nutrition that is needed by the embryo.