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Answer 1/ Antibiotics. Carbon dioxide, oxygen and bacteria are all naturally occurring. Antibiotics are generally man made.

Answer 2/ Bacteria. They are generally considered to be alive, the others are not.

Answer 3/ Carbon dioxide, the other 3 can be burnt.

Answer 4/ Oxygen. The others are not required to maintain human life (although bacteria and antibiotics can help)

As with all such questions it depends on the context...... If this is a school question from Biology I think your teacher is probably looking for answer 1

It does not entirely depend on the answer, antibiotics are not "generally" manmade, they're generally made by organisms in the environment, with some artificial production by man. The same could be said of the other 3 things.

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