Which of the following is a common source of stream pollution?

Human waste and industrial chemicals are indeed a common source of stream pollution. This type of pollution often occurs when untreated or inadequately treated sewage is discharged into waterways, leading to the introduction of pathogens, nutrients, and other harmful substances. Industrial chemicals, which may include heavy metals, solvents, and organic compounds, can enter streams through various pathways such as runoff from industrial sites, accidental spills, and illegal discharges. The presence of these pollutants can seriously affect aquatic ecosystems, human health, and the overall quality of water in streams.

In contrast, while natural organic matter, rainwater drainage, and wind erosion can influence stream conditions, they do not typically lead to significant pollution issues in the same way that human waste and industrial chemicals do. Natural organic matter usually decomposes and contributes to the nutrient cycling in ecosystems. Rainwater drainage can sometimes dilute pollutants but may also carry non-point source pollutants, which are typically not as harmful as direct discharges of human waste and industrial chemicals. Wind erosion primarily relates to soil loss and can lead to sedimentation in streams rather than chemical pollution.