Concept:The physical environment supports all life, so protecting it ensures life can continue.
Explanation:The physical environment includes land, water, air, plants, and animals.
Protecting it is mainly to ensure the survival of living things, including humans, by maintaining clean air, water, and natural resources.
The other options are benefits that depend on a protected environment, but they are not the main reason for its protection.
Answer:A. Survival of living things