In the early twentieth century, what was the prevailing view among scientists of how land animals were able to travel from one continent to another?
a. Land animals that traveled between continents were also capable of swimming.
b. Land animals that moved from continent to continent did so by hopping on stepping stones across the ocean.
c. All continents had been connected together as a supercontinent.
d. Some type of land connection allowed land animals to reach other continents.
e. Land animals that moved from continent to continent did so by rafting on materials across the ocean.
d. Some type of land connection allowed land animals to reach other continents.
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