Answer:
B Cellular Respiration
Step-by-step explanation:
In Cellular Respiration organisms use Oxygen and give out Carbon dioxide.
In Photosynthesis plants use Carbon dioxide and give out Oxygen.
B
photosynthesis takes in CO2 and gives O2, so if it were photosynthesis the lines would be swapped. cellular respiration takes in O2 and expels CO2.
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