Compare and contrast reptiles and mammals. Why were mammals able ...

[ENagel]

Compare and contrast reptiles and mammals. Why were mammals able to occupy more diverse habitats than reptiles could?
 
  What will be an ideal response?

Question 2

What were the first animals to leave the sea and adapt to a terrestrial environment? When did they do so? What physiological properties did they have that made them able to do so?
 
  What will be an ideal response?

[beccamahon]

Answer to Question 1

Answer: Reptiles are cold-blooded and lay eggs to bear young whereas mammals are warm-blooded and bear live young that they tend by suckling. The warm-blooded mammals were able to survive in more diverse habitats than reptiles because they didn't have to rely on external sources to generate energy to move and function.

Answer to Question 2

Answer: The first land animals were lobe-finned fish, which made their way onto land during the Devonian Period. These fish possessed internal sacks that could be filled with air to supplement their respiration through gills. They would also have had fins that were strong enough to move overland.