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
The material flow can be divided into the following ( ) two categories according to whether the material flow is mainly caused by human activity A: Material biogeochemical flow and its anthropogenic flow B: Material flowing with the atmosphere and with the water body C: Material industrial and agricultural flows D: Material industry flow and consumption flow
The material flow can be divided into the following ( ) two categories according to whether the material flow is mainly caused by human activity A: Material biogeochemical flow and its anthropogenic flow B: Material flowing with the atmosphere and with the water body C: Material industrial and agricultural flows D: Material industry flow and consumption flow
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