Trophic Levels. The first trophic level contains the greatest number of organisms and is comprised mainly of plants. The organisms in this layer are called primary producers because they get their energy from an abiotic source. Most primary producers get their energy directly from the sun.
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Note that the question is not, âwhy do people live in the suburbs,â which is, in my mind, a very different question. People might live in the suburbs for a bunch of reasons. Maybe thatâs where they grew up, and never left. Maybe thatâs where they work, so it doesnât occur to them to live anywhere else.