they do not
Cephalization
it look like a round worm
An earth worm is plump and long. A round worm is long and slender almost like a hair.
A hydra does not have cephalization.
Round worms are nematoda, which are, mostly, parasitic worms. A round worm is also called a Guinea worm.
In the life cycle of the round worm, a very early life stage occurring within the uterus of the female round worm.
the Filarial round worm causes elephantiasis
In the life cycle of the round worm, the second stage of life, sometimes considered the "adolescent" stage.
Ascarididae
an earth worm is longer and has more sections of the body in comparisence to a roundworm.
The cephalization of a mollusca could possibly describe the arrangement of neurons in the front end of the animal.
tape worm round worm intestinal flukes