Pollutants are substances that do harm to an environment and the beings
that live in it. Fresh water and oxygen are beneficial and necessary for
life. Hydrogen is a naturally occuring element and isn't harmful. The
EPA is a government department that works to prevent pollution.
brrrrrrrrrrrrrrrrrrrrrrr got it wrong person below me got it right its a twister
why because i read questions wrong
The aggregate (collective) of plants and plantlike organisms in plankton.