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.
X chromosome inactivation in female mammals produces the Barr Body.
Darters such as this male greenside darter form a diverse and distinctive subfamily of fishes within
Roots of the keystone species hypothesis: does a higher proportion of predators in diverse communiti
Retrograde pyelogram. A contrast medium is injected into the ureter using a cystoscope, and the X-ra
The United States is the most racially– ethnically diverse society in the world. This can be our ...
The responses of an on-center cell to contrast.