What is the name of the structure at A ? 

The gizzard is an enlarged chamber of the stomach in which _____________. 

If P. aurelia is grown in isolation with a constant food supply, its population growth will likely follow a(n):

When water is too warm and corals expel their ________________; the result is an effect known as _____________, which can kill the coral of warm conditions last too long. 

What is/are the primary function(s) of the dermal branches?  

What is the primary factor that limits the population growth of P. caudatum and P. aurelia in a closed culture?

What is structure C called?

What is the name of structure I?

What is the function of the pyloric ceca? 

The aortic arches function as hearts, pumping blood through a closed circulatory system. Therefore, which of the following are true statements about how blood travels in an earthworm?