The answer should be B. Cellular respiration breaks down glucose, while photosynthesis produces glucose
This is because plants use photosynthesis to make glucose for them while cellular respiration breaks glucose down into carbon dioxide.
The correct answer is C.
The cyanobacteria hypothesis is a leading theory for how O2 was made prevalent.
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Answer: that veins have valves to prevent backflow and arteries don’t.
Explanation: