What happened during the Cretaceous period?
A) Mammals diversified and flourished.
B) Life appeared on this planet.
C) The first animals with shells and skeletons appeared.
D) The dinosaurs reached their peak and then became extinct.
Correct Answer:
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Q9: If the entire history of Earth is
Q10: In what types of rocks are fossils
Q11: Which of the following periods did NOT
Q12: Which of the following is the importance
Q13: When did the most severe mass extinction
Q15: When did most dinosaurs become extinct?
A)around 500
Q16: Which of the following is the oldest
Q17: Most paleontologists agree that the parts originally
Q18: When did mammals undergo an evolutionary "explosion"
Q19: What was the era during which the
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