I believe the answer to be developing nations. D. Thank you.
Answer:
There are not too many disadvantages of endoskeleton .
This is why most large animal around have them.
one large animal has one of the vunerability animals face without exoskeleton.
Explanation:
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More because if the condition changed it would not be the same like it was before it was changed.
Zygote, cleavage, blastula, gastrula