The medicinal leech, once used to withdraw “unhealthy” blood from patients, produces _________ to ensure blood flow from the host?

Members of the phylum ___________ are coelomate animals with jointed appendages and external skeletons composed of chitin that cover the segmented body.

Each segment of an annelid typically contains bristles of chitin called

How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?

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.