試題詳解

18. Suppose that the circular muscles in an earthworm have become selectively paralyzed such that they are not able to contract. How will this affect the earthworm's locomotion?
(A) The earthworm will be able to elongate, but not get thicker.
(B) The earthworm will be able to get thicker, but not elongate.
(C) The earthworm will not be able to elongate or get thicker.
(D) The earthworm will be able to crawl as normal.