Assertion: Animals that have an exoskeleton, lacks an endoskeleton.
Reason: Skeleton cells in the embryonic stage migrate to either stage and produce exoskeleton
or endoskeleton but never both.

Dear Student,

Ans. Both Assertion and Reason are false. 

Exoskeleton is the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs.
Endoskeleton is the internal skeleton; bony and cartilaginous structure (especially of vertebrates). 

Animals such as Tortoise have both endoskeleton and exoskeleton. 


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