在生活、工作和学习中，大家都尝试过写作文吧，作文是一种言语活动，具有高度的`综合性和创造性。你所见过的作文是什么样的呢？下面是小编整理的考研英语作文：Plankton浮游生物，供大家参考借鉴，希望可以帮助到有需要的朋友。
scattered through the seas of the world are billions of tons of small plants and animals called plankton. most of these plants and animals are too small for the human eye to see. they drift about lazily with the currents, providing a basic food for many larger animals.
plankton has been described as the equivalent of the grasses that grow on the dry land continents, and the comparison is an appropriate one. in potential food value, however, plankton far outweighs that of the land grasses. one scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohydrates each year, the seas plankton generates more than twice as much.
despite its enormous food potential, little effect was made until recently to farm plankton as we farm grasses on land. now marine scientists have at last begun to study this possibility, especially as the seas resources loom even more important as a means of feeding an epanding world population.
no one yet has seriously suggested that plankton-burgers may soon become popular around the world. as a possible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.
one type of plankton that seems to have great harvest possibilities is a tiny shrimp-like creature called krill. growing to two or three inches long, krill provides the major food for the great blue whale, the largest animal to ever inhabit the earth. realizing that this whale may grow to 100 feet and weigh 150 tons at maturity, it is not surprising that each one devours more than one ton of krill daily.
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