The structural unit of compact bone is called an osteon, or sometimes referred to as a Haversian system. Compact bone is made up of many osteons
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The earth can be said to be a system because each component inside it interacts so that it creates a very large number of collectivities. Components in the earth are incorporated into a Geosphere, namely a layer on the surface or under the surface of the earth that has a direct and indirect influence on the survival of creatures
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