50. What is gross primary production?
(A) The carbon fixed during photosynthesis.
(B)The carbon fixed after cellular respiration is accounted for.
(C)The mass increase of producers.
(D)Photosynthetic production plus energy recycled by detritivores.
(E) Total sun radio energy received by earth
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初級生產，又稱初級生產量，是指從大氣中或...
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