Absorbing other cells gave a competitive advantage.
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Bone marrow plays an important role in our circulatory system because Bone marrow contains hematopoietic stem cells which is the major producer of red blood cells or erythrocytes,white blood cells also know as leukocytes and also platelets( thrombocytes) which is the major components of our blood,the only liquid that is very essential in our circulatory system.
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modern day example of natural selection is the green bugs on leaves wont get eaten by lizards cause they will be camoflauged but the brown ones will
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