Question

multiple choice question
what animals have a pseudocoelom?
roundworms
flatworms
tunicates
mollusks

Explanation:

Roundworms (Nematodes) have a pseudocoelom. A pseudocoelom is a body cavity that is not completely lined by mesoderm. Flatworms (Platyhelminthes) lack a body cavity (acoelomate). Tunicates (Urochordata) are chordates and have a true coelom. Mollusks (Mollusca) have a true coelom.

Answer:

roundworms