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 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
2016高考英语一轮课件优化复习(山东专用)人教版选修七UNITS 1~2
2016高考英语北师大版必修2一轮复习课件(安徽专用)《Unit 5 Rhythm》节奏
2016高考英语一轮课件优化复习(山东专用)人教版选修七Unit5 Travelling abroad——境外游
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第一节—语法专练知能闯关
2016高考英语北师大版必修3一轮复习课件(安徽专用)《UNITS7~9》
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第十一节—语法专练知能闯关
2016高考英语北师大版必修3一轮复习课件(安徽专用)《Unit 7 The Sea》海洋
2016高考英语一轮课件优化复习(山东专用)人教版选修七UNITS 3~5
2016江西省萍乡市高考英语词根词缀记忆法(二十八)
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第八节—语法专练知能闯关
2016高考英语北师大版必修2一轮复习课件(安徽专用)《Unit 6 Design》设计
2016高考英语一轮复习(福建泉州专用)北师大版选修七《Unit20》强化演练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版选修七Unit3 Under the sea——海下景观
2016高考英语一轮复习(福建泉州专用)北师大版选修七《Unit19》强化演练知能闯关
2016高考英语北师大版必修1一轮复习课件(安徽专用)《Unit 3 Celebration》庆祝
2016高考英语一轮课件优化复习(山东专用)人教版选修七Unit1 Living well——好好生活
2016江西省萍乡市高考英语词根词缀记忆法(二十二)
2016高考英语北师大版必修1一轮复习课件(安徽专用)《UNITS1~3》
2016届高考英语一轮高频考点探究4 Units4
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第十节—语法专练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版选修八《Unit23》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第九节—语法专练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版选修六UNITS 1~2
2016高考英语一轮复习(福建泉州专用)北师大版选修六《Unit16》强化演练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版选修六UNITS 3~5
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第七节—语法专练知能闯关
2016江西省萍乡市高考英语词根词缀记忆法(二十)
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第六节—语法专练知能闯关
不幸福的老公都会有哪些抱怨?
2016高考英语一轮复习(福建泉州专用)北师大版必修一《Unit1》强化演练知能闯关