Planets in the Making Are Referred to as ______

Q38: The large size of insects and amphibians

Q39: Most _rocks are devoid of fossils, which

Q40: During the_ , Earth developed its modern

Q41: What group of animals were the first

Q42: Following the reptilian extinctions at the close

Q44: Zircons found in continental rocks give evidence

Q45: The beginning of the _is marked by

Q46: What would have happened if Earth were

Q47: Evidence that Gondwana formed near the South

Q48: The _period was the "golden age of