試題詳解

51. What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates?
(A) have a body cavity completely lined by mesodermal tissue, whereas pseudocoelomates do not.
(B) have a complete digestive system with mouth and anus, whereas pseudocoelomates have a digestive tract with only one opening.
(C) have a gut that lacks suspension within the body cavity, whereas pseudocoelomates have mesenteries that hold the digestive system in place.
(D) contain tissues derived from mesoderm, whereas pseudocoelomates have no such tissue.
(E) have a body cavity, whereas pseudocoelomates have a solid body.