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PCR has opened the door to analysis of ancient DNA-DNA taken from long-dead organisms. The most useful DNA fragments in such cases typically come from mitochondrial DNA. Why do you think that is so?
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Typically used to represent an unknown variable in mathematics.
Masses
A term referring to the quantity of matter in a body, relevant in physics for calculating gravitational forces and inertia.
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The smallest and innermost planet in the Solar System, known for its swift orbit around the sun.
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The Sun is the star at the center of the Solar System, around which the Earth and other planets orbit.
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