Unit 4. Meaning o Echino= spiny o Dermis= skin The skin of these animals is stretched over an endoskeleton, or internal skeleton formed of hardened.
Unit 8 Chapter 29 Echinoderms and Invertebrate Chordates.
Class AmphibiaClass Reptilia. What characteristic of the reptile allows it to be successful on land? The Amniotic Egg.
