Question

During Devonian time life transitioned to land. Two major divisions of animals moved ashore, first the arthropods and then the tetrapod vertebrates. What fossil evidence BEST supports the classification of animals into these two basic branches, still recognized today?A)fossilized amniotic eggs
B)impressions of scales versus fur EliminateC)evidence of exoskeletons and endoskeletons D)fossilized bones with and without air cavities   
D)fossilized bones with and without air cavities

Answer 1

The answer is C) evidence of exoskeletons and endoskeletons 

Arthropods and Tetrapod  have an endoskeleton and exoskeleton. Endoskeleton is a skeleton found within the interior of the body while exoskeleton is the external skeleton that supports and protects an animal's body like the outer shell that protects them from predators.