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The mass of living material at a trophic level is the:

AStanding crop
BStanding state
CTrophic level
DPrimary yield
Answer & Solution
Correct answer: A. Standing crop
1. Each level holds a certain mass at any moment. 2. It is measured as biomass or as numbers per unit area. 3. That mass is called the standing crop. 4. So the answer is the standing crop. _Source: syllabus Biology, Ch 12 'Ecosystem'_
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