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Question

Oxygen is a gas produced by ........ and used by ..........
  1. Plants, animals
  2. Animals, plants
  3. Photosynthesis, carbon dioxide
  4. Carbon dioxide, photosynthesis

A
Animals, plants
B
Carbon dioxide, photosynthesis
C
Plants, animals
D
Photosynthesis, carbon dioxide
Solution
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Photosynthesis produces oxygen as waste. Plants and algae breathe out this oxygen into the atmosphere. We, humans and animals then breathe in this oxygen (O2) for cellular respiration to release the energy from glucose. Oxygen is needed for cellular respiration, but it does not come from this process.

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