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During a typical reproductive cycle female mammals undergo modification of their uterus and vagina to prepare for young. 

Mammals are endothermic and regulate their temperature through the nervous and endocrine system. 

How are molluscs organized? 

What does lamprey saliva contain that allows them to feed on blood? 

cover the bodies of birds and serve in making an aerodynamic structure while serve to insulate birds. 

Nematodes are round because the body muscles contract against their fluid interior and generate equal outward force. 

Choanocytes make up the choanoderm of sponges (the choanocytes have collar like structures that function in gas exchange and moving blood throughout the sponge). 

What is egg development dependent on in amphibians? 

Why do birds have salt glands? 

What is the benefit of regeneration?