Oxygen and ozone are

Options :
  1. allotropes
  2. isotopes
  3. isomers
  4. isobars
Answer and Explanation :-

Answer: Option 1

Explanation:

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Bunkum and tummyrot! You'll never get anywhere if you go about what-iffing like that. Would Columbus have discovered America if he'd said 'What if I sink on the way over? What if I meet pirates? What if I never come back?' He wouldn't even have started.
-Roald Dahl