Pure substances are either elements or compounds. Elements can NOT be separated into other types of matter (physically or chemically). Therefore, elements are pure substances. Ex: Hydrogen gas is a pure substance, as it is made up of only Hydrogen atoms or molecules.
<span>There are several instance today of how science can be used to make decisions. One very good example is forensic determination of a baby paternity. In a situation where there is controversy over the paternity of a child, DNA analysis can be used to determine the true father of a child.</span><span />
Answer:
grass clippings contain nitrogen and potasiom which can act as a fertilizer for plants but alos works as a mulch it keep light away froom weeds and retain soil mosture.
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