試題詳解

30. Which of the following statements is incorrect?
(A) Many radial animals are sessile (living attached to a substrate) or planktonic (drifting or weakly swimming).
(B) Bilateral animals typically move actively from place to place. .
(C) Most animal phyla are bilateral symmetry and have two germ layers.
(D) Sponges are basal animals that lack true tissues.