About 550 million years ago was an important period in Earth's history. What happened?
A) The continents began drifting, and they haven't stopped since.
B) A meteorite hit the Earth, killing off most species.
C) Humans moved into North America, killing off most of the large mammals.
D) All the modern groups of multicellular animals developed over a relatively short period of time.
E) The dinosaurs developed and took over most of the Earth's ecosystems, driving most smaller organisms extinct.
Correct Answer:
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