why is this statement wrong 
endoskeleton of aves have feathers scales beak and claw

Dear Student,

The given statement is incorrect because, the exoskeleton of aves is of feathers not endoskeleton. As exo meaning out side or outer surface, therefore feathers are present outside the bird body. Further, the endoskeleton contains most parts like skull, vertebral column etc. 

Therefore, the features like feather, beaks, claws and scales are external morphological characters hence, they derive exogenously. Thus, the statement is wrong.

Hope this information will clear your doubts about the topic.

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