What is the function of the respiratory system?

The lungs and respiratory system permit us to relax. They bring oxygen into our bodies (called inspiration, or inhaling) and send carbon dioxide out (called expiration, or exhalation). This trade of oxygen and carbon dioxide is called respiration.

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poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

a physical change is being made.