C. Plants perform both photosynthesis and cellular respiration.
Photosynthesis is a process used by plants, algae, and some bacteria to convert light energy into chemical energy stored in glucose, while cellular respiration is a process that occurs in both plants and animals to convert that glucose into usable energy (ATP). Plants perform both processes; they use photosynthesis during the day to create glucose and oxygen, and they use cellular respiration at all times to break down glucose for energy.
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