Roundworms (nematodes) are pseudocoelomate worms that
thrive in nearly every habitat on earth. Most are small and free living but some are parasitic on
plants and
animals .
Hookworms
for example live in the human intestine and suck blood from the intestinal wall.
They are bilaterally symetrical, facultative anaerobes that possess a slender tapered body with a
complete digestive tract in a pseudocoelom filled with fluid. A tough cuticle covers and protects
the body.
REVIEW: Which have a tough cuticle, a false coelom, and a complete digestive system and are
facultative anaerobes?
