Final answer:
The excretions of living organisms are categorized as biotic factors in an environment.
Step-by-step explanation:
The excretions of living organisms are categorized as biotic factors in an environment. Biotic factors refer to all the living components of an ecosystem, including animals, plants, and microorganisms. Living organisms excrete waste materials such as carbon dioxide, urine, and feces, which are directly or indirectly used by other organisms in the ecosystem.
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