Find the correct statement(s) among the following. A. Gross primary productivity of an ecosystem...

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Find the correct statement(s) among the following.
A. Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis.
B. The process of breakdown of complex organic matter into inorganic substances is called decomposition.
C. The base of each pyramid represents the tertiary or top level consumer while the apex represents the producers or the first trophic level.
D. A simple grazing food chain (GFC) begins with dead organic matter.
Select the correct option :
(1) \( \mathrm{A} \)
(2) A and B
(3) B and C
(4) All of the above
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