Approximately when did the mass-extinction event that led to the demise of the dinosaurs occur?
A) 50 thousand years ago
B) 443 million years ago
C) 1.4 billion years ago
D) 65 million years ago
Correct Answer:
Verified
Q29: Humans have been on Earth for _
Q30: When did our solar system form?
A) about
Q31: Evidence in the rock record shows that
Q32: About when did the first animals evolve
Q33: About when are Homo sapiens thought to
Q34: How did Earth's atmosphere become oxygenated?
A) volcanic
Q35: Geologic evidence indicates Earth's moon and core
Q37: Which class of animals rose to dominance
Q38: Earth's hydrosphere did not begin to form
Q39: About what percentage of species went extinct
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