Greenhouse gases make up what percentage of earth's atmosphere? a. less than 1% b. between 1% and 5% c. between 5% and 20% d. over 20%

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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confused

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