Answer:
A.
Step-by-step explanation:
Biodegradable substances are materials that can be broken down and decomposed by natural biological processes, such as the activity of microorganisms like bacteria and fungi. These substances can be organic or synthetic in nature. When biodegradable substances are released into the environment, microorganisms break them down into simpler compounds through a process called biodegradation. This breakdown process occurs naturally and helps to recycle the materials back into the environment. For example, food waste and certain types of packaging materials, like paper and cardboard, are biodegradable. When these items are disposed of in the environment, microorganisms will break them down over time, converting them into simpler substances that can be absorbed by plants and organisms in the ecosystem.