Chemistry
The presence of ozone in the stratosphere is responsible for

Increasing the average global temperature in recent years
Checking the penetration of ultra-violet rays to the earth
Supplying oxygen for people travelling in jets
Higher rate of photosynthesis

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Chemistry
All isotopes of the same element have ________

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

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