• 2022-06-02 问题

    The nutrient cycles between the living and nonliving parts of an ecosystem are called______________.( ) A: physical cycles B: chemical cycles C: Biogeochemical Cycles D: biological cycle

    The nutrient cycles between the living and nonliving parts of an ecosystem are called______________.( ) A: physical cycles B: chemical cycles C: Biogeochemical Cycles D: biological cycle

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