Circulatory System – Biology and Evolution
Circulatory system: A dog heart What is the circulatory system? The circulatory system takes food and air from outside your body and brings it all over your body so that [...]
26
05, 2017
26
05, 2017
What are reptiles? Biology and Evolution
Boa Constrictor snake Some kinds of amphibians evolved into reptiles about 300 million years ago. At this time, plate tectonics had moved more and more of the land on Earth into [...]
