Ecology Question:
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What are tropic levels? How many tropic levels can a food chain have?

Answer:

Tropic levels correspond to positions on a food chain. Therefore, producers always belong to the first tropic level and decomposers to the last tropic level, consumers that eat directly the producers belong to the second tropic level and so on.

There is no limit regarding the number of tropic levels on a chain, since many orders of consumers can exist.

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How is energy transferred along a food chain?What are primary consumers? Can food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?