Vergesso t1_jaby959 wrote
Reply to comment by Taibok in ELI5: Why is it that when fertilizers make their way into waterways, all the oxygen disappears, killing the fish? by Psychological-Dog994
It does not, but plants on their own breathe too. They produce more oxygen that they need, but photosynthesis happens not in the same organella that breathing does, so there is some travelling oxygen has to make before it may be used in breathing.
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