Practice problem
Heterotroph — Definition & Examples
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Food webs are sometimes represented as pyramids, as shown below. Each layer of the pyramid is separated to show which organisms eat which. The layers are called trophic levels. The first trophic level is at the bottom of the pyramid, and the numbers increase as one moves up.
Image source: By Siyavula Education CC BY 2.0 via flickr.com
Check off the trophic levels below that are assigned to heterotrophs.