Plankton 英語(yǔ)作文
Plankton浮游生物
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 sea＇s 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 sea＇s resources loom even more important as a means of feeding an expanding 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。
分布在世界海洋的數(shù)十億噸的小型動(dòng)植物浮游生物要求。 大多數(shù)動(dòng)植物太小，對(duì)人類的眼睛看到的。 他們飄流懶洋洋的潮流，提供了許多基本的食物大型動(dòng)物。
浮游生物被稱為草原相當(dāng)于生長(zhǎng)在干地上大陸，是比較恰當(dāng)?shù)摹?糧食潛在價(jià)值，遠(yuǎn)遠(yuǎn)大于浮游生物的土地種植。 科學(xué)家估計(jì)，在全世界產(chǎn)生草約49億噸，每年有價(jià)值的碳水化合物、海洋的`浮游生物帶來(lái)超過(guò)兩倍。
盡管糧食的潛力巨大，已收到效果，直到最近我們浮游生物農(nóng)場(chǎng)農(nóng)場(chǎng)種植的土地。 現(xiàn)在海洋科學(xué)家終于開(kāi)始研究這種可能性，特別是在海洋資源的機(jī)子更重要的，作為世界人口的溫飽擴(kuò)大。
但是沒(méi)有人認(rèn)真認(rèn)為"浮游生物的一塊"很快風(fēng)行全世界。 作為補(bǔ)充食物來(lái)源可能耕種，人們的極大興趣海洋浮游生物科學(xué)家。
一類浮游生物，似乎有很大的可能性是很小的收成蝦一樣?xùn)|西稱南極。 越來(lái)越兩三英寸長(zhǎng)，主要漁獲為糧食大藍(lán)鯨，最大的動(dòng)物都生活在地球上。 實(shí)現(xiàn)這一鯨魚(yú)可能增加到100英尺，重150噸，在成熟，這是不奇怪的，每個(gè)人的一噸多食海每日。
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