What is egg development dependent on in amphibians? 

Select which of the below are uses of feathers in birds (hint: there are three answers)

Amphibian kidneys produce hypertonic urine. 

Why do birds have salt glands? 

Organisms that are in group hirudinea are known as leeches. 

What is the function of the pyloric stomach in starfish? 

What is the function of green glands? 

Echinoderm skeletons are made of? 

The syrinx is a specialized region of the airways that serve as a voicebox in birds.

The plates that make up the echinoderm skeleton are referred to as spiny plates.