Multiple Choice
The geologic time scale is subdivided on the basis of
A) the appearance of different radioactive isotopes in different strata.
B) levels of background extinction.
C) periods of mass extinction.
D) the appearance of different radioactive isotopes in different strata and levels of background extinction.
E) the appearance of different radioactive isotopes in different strata, levels of background extinction, and periods of mass extinction.
Correct Answer:
Verified
Correct Answer:
Verified
Q17: Which fossil would be the oldest in
Q22: Which period is the most recent?<br>A) Triassic<br>B)
Q34: Select the most appropriate choice for each
Q36: Fossils from which would be the oldest
Q38: The result of natural selection is changes
Q39: Thomas Malthus proposed that<br>A) the food supply
Q40: Which of the following evolve?<br>A) populations<br>B) genera<br>C)
Q44: The value to Darwin of Lyell's ideas
Q45: The idea that geologic processes have formed
Q46: One part of Darwin's theory is that