Refer to the Following Information to Answer the Questions Below

question 38

Multiple Choice

Refer to the following information to answer the questions below.
Fossils of Lystrosaurus, a dicynodont therapsid, are most common in parts of modern-day South America, South Africa, Madagascar, India, South Australia, and Antarctica. It apparently lived in arid regions, and was mostly herbivorous. It originated during the mid-Permian period, survived the Permian extinction, and dwindled by the late Triassic, though there is evidence of a relict population in Australia during the Cretaceous period. The dicynodonts had two large tusks, extending down from their upper jaws. The tusks were not used for food gathering, and in some species were limited to males. Food was gathered using an otherwise toothless beak. Judging from the fossil record in sedimentary rocks, these pig-sized organisms were the most common mammal-like reptiles of the Permian period.
-Which of the following is the most likely explanation for the modern-day distribution of dicynodont fossils?

• A)Two previous supercontinents existed at different times long before the Permian period.
• B)The dicynodonts were evenly distributed throughout all of Pangaea.
• C)The dicynodonts were distributed more abundantly throughout Gondwanaland than throughout any other land mass.
• D)The dicynodonts were amphibious and able to swim long distances.
• E)The dicynodonts could survive for periods of months aboard "rafts" of vegetation, few of which made their way to the northern hemisphere.

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