A few rare times in earth history the majority of life forms disappeared "clearing the ecologic slate" for new ones.When this happens it is called ________.
A) an ecoshift
B) a half life
C) an iridium anomaly
D) a mass extinction
Correct Answer:
Verified
Q42: Which of the following is not a
Q43: The rare element iridium has been implicated
Q44: What is the Jurassic Period named after?
A)Jura
Q45: Complex, invertebrate, life forms are common as
Q46: The Phanerozoic Eon comprises approximately the _
Q47: The name of which geologic era means
Q49: What kind of materials can be reliably
Q50: Which of the following is the name
Q51: At the end of the Cretaceous (K/T
Q53: What is the source of natural carbon-14?
A)nuclear
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