Please help with this you will get a crown if you answer first When does pollution occur?

Select all that apply.

when dangerous foreign substances enter the water
when the environment becomes overpopulated
when a harmful substance is introduced into the environment
when chemicals and gasses are added to the air

A. When dangerous foreign substances enter the water

C. When a harmful substance is introduced into the environment

D. When chemicals and gasses are added to the air

Explanation:

Additionally, environmental pollution is triggered by the introduction of harmful materials, such as gaseous pollutants, toxic metals, and particulate matter (PM) into the atmosphere; sewage, industrial effluents, agricultural runoffs, and electronic wastes into water bodies. Hope this helps!

she forgets to repeat her message as often as necessary