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Freshwater (and some marine) sponges form resistant structures which function in asexual reproduction, called 

This group of animals does not possess embryological tissue layers. 

Class Monogenea have

Leeches can have up to ____ suckers for feeding.

Sponges can reproduce sexually because

Members of the phylum __________ are characterized by radial (or biradial) symmetry, diploblastic organization, a gastrovascular cavity, and cnidocytes. 

Cnidarians possess a ____________ skeleton.  

The complete inner layer of a Cnidarian is composed of

To respire means

An intracellular structure made of a fluid-filled capsule holding a coiled, hollow tube is the