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Pretty sure its d... hope this helps
Answer: A.
Explanation:
The secondary growth of a plant happens in the vascular cambium. When the vascular cambium produces more tissues, it makes the stems thicker over time.
Cellular respiration takes place in the mitochondria, which is the powerhouse of the cell<span>.
Also, the 3 phases of cellular respiration are glycolysis, the Krebs Cycle, and Electron Transport :)</span>