Select the correct answer.Which of these is a biotic factor? A. topography B. soil C. air D. bacteria

The correct answer is D. bacteria. Biotic factors are living or once-living organisms in the ecosystem. These are obtained from the biosphere and are capable of reproduction. Examples of biotic factors include any animals, plants, trees, grass, bacteria, moss, or molds that you might find in an ecosystem. In contrast, abiotic factors are non-living things in an ecosystem. Examples of abiotic factors include sunlight, temperature, wind patterns, rocks, soil, pH, pressure, etc. So, bacteria, being a living organism, is a biotic factor.