Physics
Ozone layer in the outer atmosphere helps us in

Regulating the temperature of atmosphere
Absorbing cosmic ray particles
Absorbing UV radiations
Reflecting radio waves and makes radio communication possible

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Physics
An integrated circuit is more advantages than a coventional circuit because

All listed here
A faulty part of a conventional circuit may be difficult to locate and repair
If a part of the integrated circuit fails the entire circuit is simply replaced
They make the electric equipments more reliable and easier for servicing

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