The three layers of an eye is the fibrous tunic, the vascular tunic, and the nervous tunic.
1.) it provides oxygen for humans and carbon dioxide for plants
2.) it keeps the earth warmer than it would be without the atmosphere
3.) it protects us from radiation and meteoriods
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The skeletal system<span> performs vital </span>functions<span>— support, movement, protection, blood cell production, calcium storage and endocrine regulation — that enable us to survive.</span>
