Answer:atmosphere
Explanation:Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor. This mixture of gases is commonly known as air.
<span>A lack of proteins controlling the cell cycle can cause
cancer. </span>
We could possibly use water as a fuel source, rather than fossil fuels (which are limited)
Science has already developed something of the sort, and with using water as a fuel source for say vehicles and such, it's inevitable for a positive change to happen because there would be less carbon monoxide; which means less polution.
Endocrine glands secrete hormones, while exocrine glands secrete fluids such as saliva, breast milk, sweat, etc.
Answer:
The answer is mesosphere.
Extra:
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