Section: Science

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The author most likely believes the major land development of the Cretaceous period to be:

1. A volcanic eruption.
2. The proliferation of flora.
3. The breaking up of the Pangean supercontinent.
4. The drying up of ocean life.

Answer 3 is correct. Until the Cretaceous period, the author notes, the Earth's land mass was pushed together into one major supercontinent. While there is some debate still as to what caused it to break apart, there is less argument to the fact that it did.