Which gases in the following list exist as separate atoms: hydrogen, helium, nitrogen, oxygen, neon. Select one:
a. Hydrogen and helium
b. Helium and nitrogen
c. Helium and neon
d. Oxygen and nitrogen

b) mutualism

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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.

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