Pollution is the introduction of contaminants into the natural
environment that cause adverse change. Pollution can take the form of
chemical substances or energy, such as noise, heat or light. Pollutants,
the components of pollution, can be either foreign substances/energies
or naturally occurring contaminants. Pollution is often classed as point
source or nonpoint source pollution.
Hope this helps :p
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A swarm of locusts would negatively affect an environment, due to the fact that they would consume a large amount of vegetation.<span />
<span>The respiratory system supplies the body with oxygen, which provides energy to the cells. Another important function of the respiratory system is to remove carbon dioxide from the blood stream</span>