Here are a few possible interpretations and answers:
* Non-biological substances: Things like rocks, water, air, and metals are not part of an organism's body. These are considered inorganic substances.
* Substances not produced by the organism: An organism might consume food, drink water, or be exposed to substances like pollutants. While these substances are in or on the organism, they weren't produced by the organism's own body.
* Substances that are not essential to life: While an organism needs water, oxygen, and nutrients to survive, many things are not essential and might not be part of its body. For example, a rock sitting on a plant is not part of the plant's body.
To give a more precise answer, I need a bit more context.
For example, are you asking about:
* Things in the environment that an organism interacts with?
* Things that might be harmful to an organism?
* Things that are not naturally found in the body?
Let me know, and I can give you a more specific answer!
