The carbon dioxide that is being added to the atmosphere by the burning of fossil fuels is an example of an variable to the atmosphere and an variable from the lithosphere.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

increased stability in the completion of fluorine's outer shell.

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