During the 19th century, it was common to hear people in Europe and America say that the sources of the sea were S1. ______ unlimited. For example, a noted American biologist in the mid 19th century commented that none of the great sea fisheries are to be exhausting. Today though, there is S2. ______ evidences that the resources of the sea are as seriously S3. ______ endangered as that of the land and the air, and that the S4. ______ endangered species include Herring and Carp as well as the African Elephant, Indian Tiger, and the American Eagle. Further, the threats to fish are more alarmed in some ways S5. ______ than the threats to animals and birds. This is because of fish S6. ______ is a much needed food resource and people throughout the world depend on fish as an important part of their dish, and the decline in the fish supply could have extensive effects in S7. ______ hunger and population. Fishermen in the North Atlantic alone annual harvest 20 billion pounds of fish to satisfy food S8. ______ demands, but it is important to recognize that these practices cannot continue without depleting fish storage within the next few years. Sea resources are rapid declining in many parts of the S9. ______ world, and the problem cannot ignore. We can predict that food S10. ______ supplies in the sea cannot last forever. 【S1】 【S2】 【S3】 【S4】 【S5】 【S6】 【S7】 【S8】 【S9】 【S10】