The answer is a pathogen
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One reason is for safety! in case you get stranded in a body of water you can keep yourself afloat
Explanation:
Because DNA is duplicated during interphase before the cell undergoes mitosis, the amount of DNA in the original parent cell and the daughter cells are exactly the same. Both genetics, as well as external factors, can play a role in the development of cancer.
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Glaucoma - a disease that damages the optic nerve that sends pictures to the pain. if left untreated, it can lead to loss of peripheral vision.