Name: 

(2 points) The pharynx of a flatworm releases ____________________ that begin the digestion process.

(2 points) Roundworms have ____________________ symmetry.

(2 points) Herbivorous mollusks use ____________________ to scrape algae off rocks.

(3 points) Compare the circulatory systems of gastropods, bivalves, and cephalopods.

(2 points) An oyster produces a natural pearl when a parasite or a bit of sand lodges between the shell and the mantle. The oyster then grows layers of pearl around the foreign body. Prepare for questions concerning the formation of a pearl.

(2 points) Most cephalopods lack an external shell. How can this help them? Find at least two advantages.

Alvin, a submersible vehicle used by oceanographers to study the ocean floor, has also proved invaluable in studying populations of deep-sea mollusks and segmented tube worms. The invertebrates in question live where hot seawater circulates through cracks in the ocean floor called deep-sea vents.
Suppose that you are an invertebrate biologist studying these animals. Your studies show that clams that live near the vents may grow as much as 3.8 cm per year—far more rapidly than other deep-water clams.

(2 points) Prepare for a question concerning the intake of food.

(2 points) What effect does temperature have on the clams?

(2 points) Waht effect does temperature have on the growth rate?

(2 points) Prepare for a question concerning defense mechanisms of Cephalopods.