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1、InteractionsinEcosystemsTherearemanyfactorsthatcanaffectanecosystem:water,sunlight,soil,pollution,andfirearejustafew.Wateris,inmanycases,themainfactorthatcanaffectanecosystem.Whenanecosystemisverydry,onlyasmallnumberofspeciesofplantsandanimalscansurvive.Arainforesthassomuchwaterthatmanyanim
2、alsandplantscanlivethere.Droughtcancauseplantstodie.Whenplantsdie,consumersthatneedthemforfoodwillalsodie.Anotherresourcethatcanaffectanecosystemissunlight.Someplants,suchascacti,growwherethereislittlewaterbutalotofsunlight.Withoutsunlight,plantscannotproducefoodandwilldie.Ifplantsdie,consu
3、mersthatdependonthemforfoodwillalsodie.Airpollutioncancomefromforestfiresorvolcanoes,butmostofitcomesfromcarsandfactories.Gasoline,coal,andotherfuelscanpollutetheairastheyburn.Burningfuelsreleasecompoundsofsulfurandnitrogenintotheair.ThesemixwithwaterandfalltoEarthasacidrain.Acidraincanharm
4、lakes,forests,andsoil.Itcanalsogreatlyharmmanyplantsandanimals.Forexample,thechemicalsinacidraincanharmleaves.Asaresult,theplantcannotgetthecarbondioxideitneedstomakefood.Pollutionfromcars,homes,andfactoriesmaymixwithwaterintheairtoproducesmog.Smogislikeagraycloudintheair.Itcanbeharmfultope
5、oplebecauseitmakesairhardtobreatheandcandamageourlungs.Largefirescanalsoaffectanecosystem.Firescanhavenaturalcauseslikelightening.However,themajorityoffiresarecausedbypeoplewhoarenotcarefulinhandlingfire.Firescandestroylifeonvaststretchesofland,especiallyforests.全文翻译：1.Therearemanyfactorsth
6、atcanaffectanecosystem:water,sunlight,soil,pollution,andfirearejustafew.有很多因素可以影响生态系统，水，阳光，泥土，污染，火灾只是其中的一小部分。2.Wateris,inmanycases,themainfactorthatcanaffectanecosystem.Whenanecosystemisverydry,onlyasmallnumberofspeciesofplantsandanimalscansurvive.在很多情况下，水是影响生态系统的主要因素。当周围环境十分干燥时，仅仅只有一小部分植物与
7、动物能够存活下来。3.Arainforesthassomuchwaterthatmanyanimalsandplantscanlivethere.Droughtcancauseplantstodie.Whenplantsdie,consumersthatneedthemforfoodwillalsodie.Anotherresourcethatcanaffectanecosystemissunlight.Someplants,suchascacti,growwherethereislittlewater
