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abundance
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suspended
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A．Because both have a limited supply of air, water, and other resources.B．Because the Earth moves around the sun as fast as a spaceship.C．Because we can travel to outer space.D．Because the Earth never stops moving.
A．Because both have a limited supply of air, water, and other resources.
B．Because the Earth moves around the sun as fast as a spaceship.
C．Because we can travel to outer space.
D．Because the Earth never stops moving.
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