8. A biotic factor in an ecosystem. ) water soil sunlight plants

## Step 1<br />In an ecosystem, there are two types of factors: biotic and abiotic. Biotic factors are living or once-living entities in the environment. This includes plants, animals, and microorganisms.<br />## Step 2<br />On the other hand, abiotic factors are non-living physical and chemical elements in the environment. This includes water, soil, and sunlight.<br />## Step 3<br />Given the options, only "plants" fall under the category of biotic factors.