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Biology
A natural science concerned with the study of life or living matter in all its forms and phenomena, especially in relation to their origin, growth, reproduction, structure, behaviour and evolution.
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necessary line
Sports; Football
the imaginary line the offense must cross to achieve a new first down.
foul territory
Sports; Baseball
This is that part of the playing field outside the first and third base lines extended to the outfield fence and perpendicularly upwards.