問題詳情
17. Aphids reproduce asexually or sexually. They are likely to rely on asexual reproduction when
(A) environmental conditions are good and unchanging.
(B) environmental conditions are bad and changeable.
(C) they are threatened by predators.
(D) there is a shortage of females.
(E) there are too many aphids for the host plant to support.
(A) environmental conditions are good and unchanging.
(B) environmental conditions are bad and changeable.
(C) they are threatened by predators.
(D) there is a shortage of females.
(E) there are too many aphids for the host plant to support.
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