[Campbell Biology P.747] According to the provided text, how do ectoprocts and brachiopods d... | Practice Question

According to the provided text, how do ectoprocts and brachiopods differ from flatworms and rotifers regarding their body cavity?

  • A: Ectoprocts and brachiopods have a pseudocoelom, while flatworms and rotifers are acoelomates.
  • B: Ectoprocts and brachiopods have a true coelom, whereas flatworms are acoelomates and rotifers have a hemocoel.
  • C: All four groups mentioned possess a hemocoel, but with varying degrees of development.
  • D: Flatworms and rotifers have a coelom, while ectoprocts and brachiopods are acoelomates.

Explanation

The text states: 'In contrast to flatworms, which lack a body cavity, and rotifers, which have a hemocoel, ectoprocts and brachiopods have a coelom see Figure 32.9a .' 'Lack a body cavity' implies acoelomate for flatworms.