Interpreting This Graph,can We Conclude That Polio Has Been Eradicated

question 1

Multiple Choice

Interpreting this graph,can we conclude that polio has been eradicated globally? Why or why not?

• A)Yes,as the number of reported cases goes to zero around 1965.
• B)No,because polio is part of the normal microbiota,and could become resurgent if vaccination efforts lapse.
• C)No,because the graph only depicts incidence of polio in the United States.
• D)Yes,because a zero incidence rate for over 40 years clearly indicates there are no longer any susceptibles left in the global population.

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Definitions:

Therapsids

A group of mammal-like reptiles of the Permian period; gave rise to the mammals.

Chordates

A large phylum of animals that includes all vertebrates as well as several closely related invertebrates, characterized by the presence of a notochord at some stage of their development.

Monotremes

Egg-laying mammals, such as the platypus and echidna, representing a unique branch of the mammalian tree.

Parthenogenesis

The development of an unfertilized egg into an adult organism; common among honeybees, wasps, and certain other arthropods.