Comparative characteristics of free-living and parasitic flatworms.

Comparative characteristics of free-living and parasitic flatworms.
Let’s start with the parasites.
Flat worms
A type of invertebrates. Have no body cavity. His body is slightly flattened. After a month, they begin to release eggs. It can parasitize for many years. They more often settle in the intestines. Metabolic products are excreted through the mouth opening.
Free-living worms, they are nematodes. Invertebrate type. They live in salt and fresh waters. They live in the aquatic environment in the body of this worm, male and female organs are present.