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Given ratio of boys and girls = 31 : 23Let number of boys = 31aLet number of girls = 23aThe ratio after addition of 75 girls = 124 : 107Therefore 31a : (23a + 75) = 124 : 107
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Read the passage carefully and answer the following questions 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…
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