fill out the table below. enumerate some useful and harmful materials that you can find at home or in school.if it useful, give example by which you can use it.if it is harmful,explain how can you dispose it properly Answer: the useful things that I see in school is the signs the harmful things that I have seen in school too is not cleaning the comfort room and hallway of the school Explanation: the signs are useful for someone who needed to know where is the library,cr,and others we have to clean our surroundings and not let the mosquitoes bite you... THX!
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