Plankton浮游生物小学英语作文

Plankton浮游生物小学英语作文 　　Scattered through the seas of the world are billions of tons of small plants an

Plankton浮游生物小学英语作文 Scatteredthroughtheseasoftheworldarebillionsof tonsofsmallplantsandanimalscalledplankton。Mostof theseplantsandanimalsaretoosmallforthehumaneyeto see。Theydriftaboutlazilywiththecurrents，providing abasicfoodformanylargeranimals。Planktonhasbeen describedastheequivalentofthegrassesthatgrowonthe drylandcontinents，andtheparisonisanappropriate one。Inpotentialfoodvalue，however，planktonfar outweighsthatofthelandgrasses。Onescientisthas estimatedthatwhilegrassesoftheworldproduceabout49 billiontonsofvaluablecarbohydrateseachyear，the sea＇splanktongeneratesmorethantwiceasmuch。Despite itsenormousfoodpotential，littleeffectwasmadeuntil recentlytofarmplanktonaswefarmgrassesonland。 Nowmarinescientistshaveatlastbeguntostudythis possibility，especiallyasthesea＇sresourcesloomeven moreimportantasameansoffeedinganexpandingworld population。Nooneyethasseriouslysuggestedthat" plankton-burgers"maysoonbeepopulararoundtheworld。 Asapossiblefarmedsupplementaryfoodsource，however， planktonisgainingconsiderableinterestamongmarine scientists。Onetypeofplanktonthatseemstohavegreat harvestpossibilitiesisatinyshrimp-likecreaturecalled krill。Growingtotwoorthreeincheslong，krill