Flatworms

This is a tapeworm.

This is a fluke.

1.  There are three main types of flatworm.There are tapeworms, flukes, and planarians.
2.   Some are parasites  and some are scavengers.
3.   They have only one opening, for eating and getting rid of waste.
4.  They have flat bodies. they are usually soft. 
5.   Parasites live in other creatures.
6.  Flatworms live in damp places.

this is a planarian