Write two characteristic features of energy flow in an ecosystem.
(N/A) $(i)$ The flow of energy is unidirectional, meaning it moves from producers to consumers and cannot be reversed.
$(ii)$ There is a significant loss of energy as heat at each trophic level, following the $10\%$ law, which limits the number of trophic levels in a food chain.
$(ii)$ There is a significant loss of energy as heat at each trophic level, following the $10\%$ law, which limits the number of trophic levels in a food chain.
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