One Major Difference Between Flatworms and Roundworms is That _____

Question

One major difference between flatworms and roundworms is that _____.
A)roundworms are never parasites
B)flatworms are never parasites
C)roundworms have a pseudocoelom
D)flatworms don't infect humans

Accepted Answer

Roundworms have a pseudocoelom, which is a fluid-filled body cavity that surrounds the gut, while flatworms lack a body cavity. None of the other options are correct – both flatworms and roundworms include species that are parasites, and flatworms can infect humans (such as the tapeworm).