Which physical system includes all plants, animals, and people?
a. atmosphere
b. biosphere
c. lithosphere
d. hydrosphere

Biosphere

Explanation:

The biosphere is the name that is given to the sum of all ecosystems. The biosphere is the system that includes all living beings and their relationships. This sphere interacts with others such as the atmosphere, the lithosphere, the geosphere and the hydrosphere. Therefore, this is the physical system that includes all plants, animals and people.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.