試題詳解

26. A caterpillar that never matures into an adult, but simply gets larger and larger with each molt. It might be possible that the caterpillar did not mature into an adult because of
(A) a lack of ecdysone.
(B) a lack of juvenile hormone.
(C) a lack of melatonin.
(D) a decreased level of ecdysone.
(E) an increased level of juvenile hormone.