A number increasing of lakes and rivers D . A number increasingly of lakes and rivers E . A . was preyed upon by very few native predators in its new environment B . found very few predators in its new environment. Scientists are concerned when the mussels B . Scientists are concerned that if die mussels C .
Scientists are concerned where in the mussels D .
Scientists are concerned that the mussels E . Scientists are concerned as if the mussels Example 4 The writer wishes to add a sentence at the end of Paragraph 1 that will serve as a transition between Paragraphs 1 and 2 and will establish the main focus of the essay. The zebra mussel wfll provide a difficult challenge for public utility managers. The zebra mussel is only the latest in a series of newly introduced species to thrive in the U.S. C . No one knows how far south and west the zebra mussel is likely to spread, but scientists think they may be on the trail of important clues D .