Which of the following is a way that humans impact rivers and streams?
a. pollution
b. dams
c. flooding
d. all of the above

Pollution, dams, flooding are the humans Impact which affect the rivers and streams.

Further Explanation:

Pollutants are defined as the substance which causes pollution. Pollutants can be present in any forms from gaseous to solid. The pollutants can persist in the environment and keep on causing damage to the different ecological niche.

The example of pollutants can be:

Human activities have led to the increase in the amount of the pollutants in the environment from past many years.  This increase has been on peak in last few years as a result of industrialization and various other human activities. Pollution destroys the beauty of the rivers and streams. It contaminates the water. Dams act as reservoir of water that is used for consumption. They affect the stream and rivers increase the chances of flooding. Also, Flooding cause streams and rivers to overflow. Thus, dams, flooding and pollution are human impacts that affect the stream and rivers.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Ecology

Keywords:

Human activities, dams, rivers, stream, flooding, pollution, water, particles, industries, pollutants, nitrogen oxide, carbon dioxide, water, contamination.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.