Usually, they aren't found in the same place because fossils are already very rare. For every 1 billion humans, there would only be one fossil. So the odds would be very slim for them both to be found in the same place.
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B- Carbon nitrogen and oxygen. All organisms are made up of carbon, oxygen is essential to breath, and nitrogen makes up most of earth's atmosphere.
The products would be an alcohol and a salt. so it would be A.