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There are generally a greater number of individuals at the lower trophic levels of an ecosystem.

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15% can be taken as the average value for the amount of organic matter that is present at each step and reaches the next level of consumers.

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The green plants capture about 10% of the energy of sunlight that falls on their leaves and convert it into food energy.

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In any food chain, an average of 10% of the food eaten in turned into the body mass of an organism and made available for the next level of consumers.

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Harmful chemicals enter into our body through biological magnification.