The dark brown color of a penny is most likely oxidation, which occurs when the copper in the penny comes in contact with oxygen.<span> </span>
D Bc I just did it and got it right
Respiratory system and the cardiovascular system
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Chromosome are part of DNA cells and threads like structure which contains the human genetic coded information for the humans . humans have total 46 chromosomes .
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Microscope i believe.. let me know if its correct :)
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