Scattered through the ea of the world are billion of ton of mall plant and animal called plankton. Mot of thee plant and animal are too mall for the human eye to ee. They drift about lazily with the current, providing a baic food for many larger animal.
Plankton ha been decribed a the equivalent of the grae that grow on the dry land continent, and the comparion i an appropriate one. In potential food value, however, plankton far outweigh that of the land grae. One cientit ha etimated that while grae of the world produce about 49 billion ton of valuable carbohydrate each year, the ea' plankton generate more than twice a much.
Depite it enormou food potential, little effect wa made until recently to farm plankton a we farm grae on land. Now marine cientit have at lat begun to tudy thi poibility, epecially a the ea' reource loom even more important a a mean of feeding an expanding world population.
No one yet ha eriouly uggeted that " plankton-burger" may oon become popular around the world. A a poible farmed upplementary food ource, however, plankton i gaining coniderable interet among marine cientit.
One type of plankton that eem to have great harvet poibilitie i a tiny hrimp-like creature called krill. Growing to two or three inche long, krill provide the major food for the great blue whale, the larget animal to ever inhabit the Earth. Realizing that thi whale may grow to 100 feet and weigh 150 ton at maturity, it i not urpriing that each one devour more than one ton of krill daily.[由好作文www.hAOzuowEn.com整理]