eourlivesaffectstheenvironment.Theenvironmentisallthethingsaroundyou.AllacrossEarth,humansare 31 theenvironmentinsmallandlargeways.Wecutdowntreestobuildhouses.Weplowfieldsto 32 crops.Wepourwasteintorivers,lakesandoceans.sandbiggerboatstocatch 33 numbersoffish.Activitiesliketheseaffectplantsandanimals.They 34 affectthingslikethesoilandwater. Sometimesouractionsmakethenumberofa 35 plantoranimalgetlarger.Forexample,ifyouplantedrosesinyouryard,therewouldbemorerosesinyourarea. Ouractivitiescanalso 36 toasmallernumberofplantsandanimals.Ifaparkwereturnedintoanapartmentbuilding,whatwouldhappentotheplantsandanimalsthere?Well,theywould 37 dieormovetoother 38 .Therewouldbefewerplantsandanimals. Pollutionandotheractivitiessometimescausethenumberofaspecies(物种)eso 39 thatitcannotsurvive.Aspeciesthatisin
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