H D4 TS Q10 – Selective High School

The global population of frogs has declined in recent years while the amount of UV radiation reaching the Earth has increased. Since the genetic material in frog eggs is harmed when exposed to ultraviolet radiation, the frog population decline is probably due, at least in part, to the increase in ultraviolet radiation.

Which of the following, if true, provides the strongest support for the argument?

Even in regions with no significant increase in ultraviolet radiation, only a small number of frog eggs laid ever hatch. In areas with the least decline in frog populations, populations of species of insects that frogs eat have decreased. The eggs of declining frog species contain higher concentrations of damaging pesticides than the eggs of frog species whose populations have not declined. Populations of frog species that hide their eggs beneath rocks or under sand have declined considerably less than populations of frog species that do not cover their eggs.

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Which of the following, if true, provides the strongest support for the argument?