Chemistry
The fundamental particles present in the nucleus of an atom are

Neutron, electron
Proton, neutron
Neutron, positron
Electron, proton

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Chemistry
Water cycle refers to

An integrated attempt to recycle water in relatively arid regions
Scientific management of water in areas excessively plagued with water-logging
Water distribution in relatively dry areas
Constant movement of water from ocean to land and back to ocean once again

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