Find the correct statement among the following. (1) Crop fields are an example of a natural ecos...

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Find the correct statement among the following.
(1) Crop fields are an example of a natural ecosystem.
(2) Humus is a reservoir of microbes and undergoes decomposition at an extremely high rate.
(3) The standing crop is measured as the mass of living organisms or the number in a unit area.
(4) The energy at a lower trophic level is always less than at a higher level.
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