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Which important gas is a common by-product of photosynthesis?

See here what other people have answered:

  • Carbon dioxide
  • Oxygen
  • Hydrogen
  • Helium
35%
61%
3%
1%
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Interesting fact:

The average adult person has about 100,000 million neurons in their brain. That’s a lot of biology. In fact, if we were to line up all of these neurons, they would reach a distance of 1,000km. Impressive little fellas, huh?

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