Since the ferocity of ocean storms is increasing, increasingly high seawalls must be built between beaches and beachfront property.
Even when beaches are heavily used by people, they are necessary to the survival of the many wild species that use them.
Seawalls constructed to protect beachfront buildings will not themselves eventually be damaged by storms and will not require, if they are to protect the buildings, expensive repair or replacement.
The conservation of beaches for future generations should be the overriding goal of shore management at ocean coasts.
Trying to protect beachfront buildings by constructing seawalls is counterproductive in the long run for an oceanfront community wishing to maintain itself as a beach resort.
8. A study found that 70 percent of children surveyed in 1970 had at one time had cavities, whereas only 50 percent of those surveyed in 1985 had ever had cavities. The researchers concluded that the level of dental disease in children had declined between 1970 and 1985. Which of the following, if true, would most seriously undermine the researchers conclusion presented above?
Cavities are the most common kind of dental disease to which children are subject.
The children surveyed came from a broad variety of income backgrounds.
The children surveyed were selected from among students of teachers cooperating with the researchers.
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