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Environmentalists think the world is coming to a bad end __________.

Embryonic stem cells are the master cells that have the potential to grow into any other type of cell in the body. For instance, __________.

Among the psychological effects of heavy drug use among students are a loss of interest in schoolwork and a tendency to lie. Moreover, __________.

Since the 1990's, there have been many attempts to mend faulty genes using gene therapy, but so far there have been only one or two successes. Although we are getting better at predicting genetic diseases, __________.

Marine mammals use their voices far more effectively than land animals due to several reasons. One of them is that water is a better conductor of sound than air. In other words, __________.

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