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12.Ecosystem
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An ecosystem, such as an aquarium, is selfsustaining if it involves the interaction between organisms, a flow of energy, and the presence of
A
equal numbers of plants and animals
B
more animals than plants
C
materials cycles
D
pioneer organisms
(AIIMS-2009)
Solution
If a ecosystem is to be self-sustaining, materials such as oxygen, carbon dioxide, water and nitrogen must to recycle between the organisms
Standard 12
Biology
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