No
No, worms do not have an endoskeleton and they don't have an exoskeleton, either.
round worms are round and flat worms are flat!
Round worms are nematoda, which are, mostly, parasitic worms. A round worm is also called a Guinea worm.
No, worms are not arthropods because they do not have a shell. All arthropods have an external shell or an exoskeleton which is used to define them or classify them.
Worms do not have an exoskeleton like insecta or crustacea, but rather a membrane that covers it's entire body. I am not sure whether or not it is hydrostatic, though I highly doubt it.
The scientific name for round worms is "nematodes."
Round worms, segmented worms, and flat worms
flat worms,segmented worms, and round worms.
No
There are a number of them : sea sponges, worms, cnidarians to name a few.
1. Round Worms 2. Flat Worms 3. Segmented Worms
Round Worms.