<span>The sun's energy reaches Earth in the form of photons. This energy can be converted into electricity or heat. Solar collectors are already used successfully by energy companies and homeowners to produce electricity. New technological advances have increased efficiency of solar collectors by concentrating solar power using solar cells</span>
<span>Bone marrow which is located <span>within the spongy or cancellous portions of bones is the essential site of new blood cell production or hematopoiesis. Bone marrow contains stem cells which able to differentiate into specialized cell types. People with diseases like blood cancers, such as leukaemia and lymphoma, sickle cell anaemia, and other rely on bone marrow transplantation to survive.</span></span>
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