Cnidarians have a well-defined head along with radial symmetry

The Phylum Annelida has a metameric body plan. Which two other Phyla also show metamerism?  

Which group of molluscs has mostly lost the radula and switched to filter feeding? ________________________

A pearl is produced in response to an irritant such as a grain of sand becoming lodged between the shell and the mantle.  The material that makes the pearl is called _____________________

In “errant” polychaetes, what are the parapodia used for?

This tapeworm infects humans who eat undercooked beef. What is its genus and species name?

This tapeworm infects humans who eat undercooked beef. What is its genus and species name?

Clonorchis sinensis is a ________________________

Which group of molluscs has mostly lost the radula and switched to filter feeding? ________________________

In the Digenean trematodes, the redia stage is used to asexually increase the number of infective larvae.