acoelomate animals

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

Another name for a protonephridium is a

The cells that form a meshwork filling the spaces between the muscles and organs that develops from the mesoderm is called

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

While most of the Platyhelminthes are free living or endoparasites, which one of the following taxa has an ectoparasitic life cycle?

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

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

The protonephridia function in