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The unit of inheritance in organisms, generally consisting of a piece of DNA.
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One of the brightest comets to be seen for decades, reaching its peak on 1 April 1997.
A very small dense star that is no longer capable of nuclear fusion.
A boundary where two tectonic plates slide past each other.
The gradual change in living forms over sucessive generations.
An animal that gets most or all of its energy from eating other animals.