The oxygen concentration in this aquarium was measured over a period of time.
It increased during daylight and decreased at night.
Which processes caused these results?
1 )
oxygen increase (day): animal nutrition
oxygen decrease (night): decay
2 )
oxygen increase (day): decay
oxygen decrease (night): animal nutrition
3 )
oxygen increase (day): movement
oxygen decrease (night): photosynthesis
oxygen increase (day): photosynthesis
oxygen decrease (night): respiration
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