40. A “complete digestive tract” differs from a gastrovascular cavity in that only the complete tract
(A)has specialized compartments.
(B)permits extracellular digestion.
(C)allows elimination of undigested wastes.
(D) has teeth and tentacles to help with ingestion.
(E)uses its surface area for nutrient absorption.
寫作批改
VIP與詳解卡管理
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