本题目来源于试卷: Interaction & Interdependence C.9 Transfers of Energy & Matter，类别为 IB生物学
[单选题]
Corals, oysters and sea urchins use calcium carbv91kex)*6s,vt -t3svk( ypkvi lu7 xxonate to build tvxh8vx- a d(6sheir shells. Which of the following is NOT a sou(a-8s xxvd 6vhrce of carbon for these ocean-dwelling organisms?
A. Respiration by plants and other organisms.
B. Respiration by microorganisms in the oceans.
C. Calcium ions in the ocean waters.
D. Carbonate ions formed by dissolution of $CO_2$ in water.
参考答案: C
本题详细解析:
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