本题目来源于试卷: Aquatic Food Production，类别为 IB环境系统与社会
[单选题]
State which of the fkf6/w,k ck 2adollowing is no;,qosraq x. p1t true about phytoplankton.
A. They are the base of aquatic food chains.
B. They are photosynthetic organisms.
C. They produce almost half of the earth's oxygen.
D. They live at the bottom of the ocean.
参考答案: D
本题详细解析:
Phytoplankton are aquatic organisms that are capable of produ f 0cwzj7, fwd,w7j8xpcing their own food by photosynthesis, so option B is true. The fact that they are producers makes them the base of many aquatic food chains, so option A is true. Due to their abundance in the oceans, phytoplankton are estimated to be responsible for the production of half the oxygen on our planet, so option C is true. Since they are0c pfjwx,d7z wj78w, f photosynthetic and need to capture sunlight, phytoplankton exist in the top layers of the ocean. Therefore the correct answer is option D.
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