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The populations become completely separated from one another</span>
A—A because we can use technology to our advantages
I believe the answer is D. The NASA mission which sent a probe to collide with a comet's nucleus is the Deep Impact. It is the first mission sent in order to see the interior of a comet. The comet that was aimed was called the Comet Tempel 1.
The Earth gets its heat from the sun.
