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 are living components of an ecosystem that can have a direct or indirect impact on other organisms. Excretions, such as urine or feces, are produced by living organisms and can affect the nutrient levels, water quality, and overall balance of an ecosystem.
Learn more about Biotic factors in an environment