Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

They use less oxygen
Their lungs are very large
They have extra air sacs
They fly inactively

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Physics
To resolve an object in an electron microscope,

None of these
The wavelength of the electrons must be close to the diameter of the object
Both A & B
The wavelength of the electrons must be greater than the diameter of the object.

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