Question

what is the most serious effect of water pollution created by human activity?
it can affect the health of people or animals.
it can affect the air surrounding it.
it can interfere with future building in the area.
mark this and return

Explanation:

Water pollution from human activity, like the garbage in the image, can contaminate water sources. People or animals that consume or come into contact with this polluted water can suffer health issues. For example, water - borne diseases (like cholera from bacteria in polluted water) can affect humans, and animals may get poisoned by toxic chemicals in the water. The other options are less serious: water pollution doesn't directly affect air (unless there's evaporation of certain pollutants, but that's not the main effect here), and while it might have some indirect impact on future building (like needing to clean up the water first), the immediate and most critical impact is on health.

Answer:

It can affect the health of people or animals.