Abnormally high concentrations of _______ have been found in rocks dating from the end of the Cretaceous.
A) iridium
B) mercury
C) lithium
D) nickel
E) tungsten
Correct Answer:
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Q48: Which statement about oxygen levels on Earth
Q49: Rocklike structures formed by the oxygen-generating cyanobacteria
Q50: During the _ period, the biota recovered
Q51: Refer to the graph showing variations in
Q52: Humans reached North America approximately _ years
Q54: The possible collision of a large meteorite
Q55: Refer to the graph showing variations in
Q56: Rodents, marsupials, and hoofed animals first appeared
Q57: Refer to the figure. Q58: At the end of the _ period,
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