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Answer:
The three components of the cell theory state that all living organisms are composed of one or more cells, the cell is the basic unit of structure function and organization. and all cells come from pre existing cells Hopefully this helps!
I suggest you to provide some options, as it's quite difficult to answer your question. Here is your answer: A long bone is covered externally with a sheath called the
periosteum, whereas the marrow cavity is lined with the <span>
endosteum</span>
. I've attached the illustration to make it clear for you