Chemistry
All isotopes of the same element have ________

The same atomic number and the atomic mass
Different atomic numbers and different atomic mass
The same atomic number but different atomic masses
Different atomic numbers and the same atomic mass

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Chemistry
Water cycle refers to

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

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