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
C) evidence of exoskeletons and endoskeletons
D) fossilized bones with and without air cavities