The piece of information is supported with text features are the main steps needed to protect all city residents from the harmful effects of pollution.
The introduction of pollutants into the environment's natural systems that have a negative impact is pollution. Any material (solid, liquid, or gas) or energy can be considered a kind of pollution (such as radioactivity, heat, sound, or light). The elements of pollution, or pollutants, can be either naturally occurring toxins or substances or energy from outside the body.
The term "pollution" often suggests that the pollutants have an anthropogenic source, which is a source made by human activity, even if environmental contamination might be brought about by natural processes. Air pollution, light pollution, noise pollution, plastic pollution, soil contamination, radioactive contamination, thermal pollution, visual pollution, and water pollution are some of the most prevalent types of pollution.
Hence the correct option is D
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If the frequency of the sound is increased then the pitch will also increase.
