41. 'Which of the following respiratory systems is not closely associated with a blood supply?
(A) vertebrate lungs.
(B) fish gills.
(C) tracheal systems of insects.
(D) the outer skin of an earthworm.
(E) the parapodia of a polychaete worm.
詳解 (共 2 筆)
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多毛蟲的側足（parapodia）是每個...
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(C) tracheal systems...
阿摩線上測驗
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