本题目来源于试卷: IB ESS Unit 2: Ecosystems & Ecology，类别为 IB环境系统与社会
[单选题]
Figure: A marine foo +hbv7k c58xjf+ok;t dd 7o f5( ulvka*c1pq yv;nk/,dc web
[Source: Cmglee. (2003, October). File: Arctic Food Web.svg - Wikimedia Commons. Wikimedia Commons. Retrieved April 14, 2022, from https ://commons.wikimedia.org/wiki/File: Arctic_food_web.svg. Copyright under CC BY-SA 3.0]
State which organism is both a secondary and a tertiary consumer.
A. Harbour seal
B. Polar bear
C. Arctic cod
D. Capelin
参考答案: C
本题详细解析:
Arctic cod feeds on herbivorous zooplankton which is a primary consumer as bpidx wbl :ho9;o( ggu/ :eov;v):-which makes Arctic cod a secondary consumer. Arctic cod also consumes carnivorous zooplankton which is a secondary consumer, making Arctib9wp soduvvl:h/x);gab ;e:oo g (i-:c cod both a tertiary and secondary consumer.
Harbour seals (Option A), polar bears (Option B) and capelins (Option D) are all tertiary consumers, not secondary consumers.
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