Setting up an aquarium that represents a mini ecosystem has to have which of the following requirements:

a. fish and water only
b. water sand soil and light only
c. populations of fish snails and plants only
d. communities of different species of organisms water sand soil and sunlight



The correct answer is letter d
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The possible answer is d. it should have all those mentioned in d for it to represent an ecosystem, because you cannot have an ecosystem with only one kind of organism or with only the abiotic factors only, but it should also have some plants
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