Plants, algae, and many single-celled organisms can photosynthesize using a specialized cell organelle called a chloroplast. Do
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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
