A decrease in energy flow as we move up through the food pyramid explains why there are fewer people at the top of the food pyramid. Energy becomes less and less useful to support life as it moves from one trophic level to the next. such as plants, have the largest biomass because photosynthesis converts solar energy into chemical energy. This energy may then be used to power the entire food chain. As we move up the food chain, however, each level receives just a tiny amount of the energy from the level below it. As a result, there are fewer tertiary users since there is not enough energy to sustain a significant whole bunch of people at this level.make this like a 7th grader wrote it
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As we go up the food pyramid, there are less and less living things. This is because the energy from food becomes less useful as it goes from one level to another. Plants have the most living things because they use sunlight to make food through photosynthesis. This food can then be used by other animals. But as we go up the food chain, each level only gets a little bit of energy from the level below it. So, the number of animals at the top of the pyramid, like the tertiary users, is much smaller because there isn't enough energy to support a lot of them.