Which gas did volcanoes not produce in the precambrian era?
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a. oxygen
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b. sulfur
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c. water vapor
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d. carbon dioxde

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

i dont know it at allnow im just getting points at this pint

the answer is cell division : )