The exoskeleton is made of ____________, which is extremely strong and flexible.

Many mollusks feed using a rasping, tonguelike structure called the _________. 

Which one of the following applies to the phylum Ctenophora?    

_____________ are flagellated cells that line internal cavities and are responsible for pumping water and small particles into the sponge.

Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.  

Many members of the phylum _____________ have a shell, and many have a rasping, tongue-like feeding structure called a radula.

 The idea of the insanity defense is based on the principle that:

If you selected ‘other’, please provide your suggested topic below:

Homer Plessy was arrested for:

The Poll Tax was used: