acoelomate animals

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Another name for a protonephridium is a

The members of the phylum Platyhelminthes are called flatworms because their bodies are flattened

While the previous phyla have used intracellular digestion, within these three phyla extracellular digestion is the norm. Extracellular digestion means that

The body of the parasisitc flatworms is covered in a syncytial layer called

The cells that secrete mucus in the epidermis of the Turbellaria are called

A cuticle is different from a tegument in that a cuticle is ______ while a tegument is _______.

The nervous system of the flatworms has sensory, motor, and association nerves, and it is organized into a ______ pattern.

The protonephridia function in