Which of the following types of organisms occ | vedclass

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(C) In an aquatic ecosystem,organisms like fish often occupy more than one trophic level. For example,a small fish may feed on zooplanktons (primary c

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Fish

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(C) In an aquatic ecosystem,organisms like fish often occupy more than one trophic level. For example,a small fish may feed on zooplanktons (primary consumer,trophic level $II$),while a larger fish may feed on smaller fish (secondary or tertiary consumer,trophic level $III$ or $IV$). Phytoplanktons are producers (trophic level $I$),zooplanktons are primary consumers (trophic level $II$),and frogs typically occupy a specific niche as secondary or tertiary consumers depending on the food web structure,but fish are the most classic example of organisms that can shift trophic levels based on their size and diet.

$1$. Standing state	$p$. Mass of living material at a given time
$2$. Pioneer species	$q$. Amount of nutrients in the soil at a given time
$3$. Detritivores	$r$. Species that invade a bare area
$4$. Standing crop	$s$. Breakdown detritus into smaller particles

Which of the following types of organisms occupies more than one trophic level in an aquatic ecosystem?

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Biological equilibrium is found among the

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$(b)$ Production and decomposition

Time is a crucial factor for . . . . . . .

Which of the following has the largest population in a food chain?

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