Which statements are true about point and nonpoint source pollution? human activity causes point and nonpoint source pollution. only nonpoint source pollution affects abiotic factors in a watershed. point source pollution affects only the part of the lake or river near it. both point and nonpoint source pollution affect biotic factors in a watershed. point pollution flows through the bodies of water in a watershed but not through its land.

Both point source pollution and non-point source pollution affect biotic factors in a watershed.

Explanation:

The introduction of dangerous items into the environment is referred to as pollution. Pollutants are the term for these dangerous compounds.

Statements (i) or (a) and (iv) or (d) are true about the sources of non-point and point pollution.

1. Point source pollution (PSP) is any contaminant that enters the environment from a restricted and easily identifiable source.

2. Nonpoint-source (NPS) pollution is the polar opposite of point-source pollution in that contaminants are spread out over a large area.

Therefore,  Point and nonpoint source pollution are both caused by human activities, and both have an impact on biotic variables in a watershed. This proves that statements (i) and (iv) are the right sources of responses.

For more information about pollution, refer to the link below:

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the rub-al-khali is also known as the arabian desert and the "empty quarter"