Practice problem
Biotic Components of Ecosystems — Definition & Examples
By Valeri Natole
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A scientist takes three trees that were born in the same forest. He keeps one where it is, moves the second to an area with more leaf litter on the ground, and moves the third to an area with more rain. He then records the trees' health over a few months. A happy face means the tree is healthy, and a sad face means it is not.
Which of the factors of the scientist's experiment are biotic? (Check all that apply.)