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CATIE When Bacteria attack ä What do all bacteria have in common? ä Draw and label a bacterium in the space below. ä How do bacteria reproduce? ä How are bacteria produced by this method of reproduction different from their parent? ä Which environmental conditions do most bacteria like? ä From the time it comes into existence, how many times will a bacterium reproduce in three hours? ä Do bacteria harm humans? www.catie.org.uk 1 | 2 CATIE When Bacteria attack ä Teeth What do bacteria in our mouths feed off? ä How are the shapes of teeth suited to their function? ä Why is it important to brush teeth regularly? ä Why is fluoride added to toothpaste? ä What does an oral care formulator do? ä 2 Skin How many layers does the skin consist of? ä What are the layers of skin called and how do they differ from each other? ä How do spots form? ä What is the best way to prevent spots? ä Why do teenagers often get spots? www.catie.org.uk | 2