What is the difference between secretion and excretion?

 

Name at least two other functions of tonoplasts.

 

How can a simple animal such as a Hydra eliminate wastes if it only has a gastrovascular cavity?

 

 

How can you prove that the contractile vacuole of a Paramecium regulates water?

 

 

Why do Planaria need flame cells when they are so small and flat? Can't diffusion be used to eliminate wastes and excess water?

 

 

How do Malpighian tubules help insects eliminate a semisolid waste product?

 

 

What do earthworms do when they need to regulate their body fluids?

 

 

What is a nephron unit and how does it differ among animals?

 

 

Fish, some birds and some reptiles use accessory organs. Do you know what they are?