(C) Employees of businesses that close during a recession make up the majority of the workers who lose their jobs during that recession.
(D) Sometimes recovery from a recession does not promptly result in a decrease in the number of people who are jobless.
(E) Workers who lose their jobs during a recession are likely to get equally good jobs when the economy recovers.
4. Scientists analyzine air bubbles that had been trapped in Antarctic ice during the Earth’s last ice age found that the ice-age atmosphere had contained unusually large amounts of ferrous material and surprisingly small amounts of carbon dioxide. One scientist noted that alage absorb carbon dioxide from the atmosphere. The scientist hypothesized that the ferrous material, which was contained in atmospheric dust, had promoted a great increase in the population of Antarctic algae such as diatoms.
Which one of the following, if true, would most seriously undermine the scientist’s hypothesis?
(A) Diatoms are a microscopie form of algae that has remained largely unchanged since the last ice age.