Which of these is NOT a piece of physical evidence that supports scientific theories of Earth's evolution over
geologic time due to natural processes?
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A
B
C
D
The existence of different layers in the Earth's crust, with older layers deeper down and newer
layers closer to the surface
The presence of living organisms on Earth that have undergone significant changes over time,
including the evolution of new species and the extinction of others
The presence of a magnetic field that has reversed direction multiple times over the course of
Earth's history
Changes in Earth's atmosphere over time, including the presence of oxygen and the formation of
ozone