hints:
the earth does not keep the sun in orbit
there were no people around at first
We would have a lot of trouble generating life with no atmosphere
we get most of our heat from the sun
The earth's differentiation and size were significant factors for life on Earth because Earth's composition and gravitational attraction _____.
A-keep the moon and sun in orbit
B-keep people grounded
C-helped to create and retain Earth's atmosphere
D-create and retain internal heat
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