In molluscs, generally, the dorsal body wall folds to form the ____________________

Which Class of the molluscs has members that have completely lost their shells?  _________________________

All the parasitic flukes belong to the class Trematoda. 

Annelids do not have a rigid internal or external skeleton as seen in chordates and arthropods, respectively.  Yet many are efficient burrowers. Briefly describe how an annelid, such as an earthworm, can move through a tunnel in the soil.

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

The Cnidarians consist of two layers of tissue. This body form is termed  _________________

Clonorchis sinensis is a ________________________

One of the characteristics of the Cnidarians is an extracellular matrix found between the two body layers. It is called the __________________

The specialized stinging organelles that are characteristic of the Cnidarians are called: 

What term matches the following definition? “The medieval political, social, and economic system held together by the relationship between landholding liege lords and the vassals who were granted tenure of a portion of their land and in turn swore allegiance to the liege lord.”