1. Chemistry helps firefighters O determine which chemicals to use to fight different types of fires
O calculate how much water pressure is available at a hydrant
O know the angles at which they can safely deploy ladders
O identify the temperatures at which different substances burn

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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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