Physics
The laws which govern the motion of planets are called ________

Newton's Laws
Kepler's Laws
De Morgan's Laws
Avogadro's laws

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Physics
Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure is the same as that outside.
normal humidity and partial vacuum are maintained.

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