Examlex
The ________ sphincter controls the movement of substances from the pylorus of the stomach into the small intestine.
Human Health
The state of complete physical, mental, and social well-being, not merely the absence of disease or infirmity.
Acid Rain
Precipitation with a lower pH than normal, caused by emissions of sulfur dioxide and nitrogen oxides from industrial processes and vehicles, which can harm ecosystems and human-made structures.
Secondary Pollutants
Pollutants that are not emitted directly into the air, but form when primary pollutants react in the atmosphere.
Earth's Surface
The outermost layer of the Earth, encompassing both land masses and water bodies.
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