Human, fish and reptile heart
Heart .
17.4 Reptiles
Circulatory system
Circulation and Gas Exchange Chapter 42. Overview: Trading with the Environment Every organism must exchange materials & energy with environment Exchanges.
Circulation and Gas Exchange Chapter 42
The Reptile Body. Characteristics of Reptiles Reptiles were the first vertebrates to live on land Scales keep moisture inside – Reptiles eggs DO NOT dry.
