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A species that exerts an influence out of proportion to its abundance in an ecosystem is called a keystone species. The keystone species may influence both the species richness of communities and the flow of energy and materials through ecosystems. The sea star Pisaster ochraceus, which lives in rocky intertidal ecosystems on the pacific coast of North America, is also an example of a keystone species. Its preferred prey is the mussel Mytilus californianus. In the absence of sea stars, these mussels crowd out other competitors in a broad belt of the intertidal zone. By consuming mussels, sea star creates bare spaces that are taken over by a variety of other species. A study at the University of Washington...
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Rearrange the following four sentences (A), (B), (C) and (D) in the proper sequence to form a coherent paragraph. (A) Against this background, the current target of 12.8 percent does not seem that high a figure. (B) A better vantage point to evaluate the 12.8 percent target for export…
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