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What type of process is used to produce ATP?

  1. Oxidation

  2. Photosynthesis

  3. Respiration

  4. Nitrification

The correct answer is: Respiration

Respiration is the correct answer because it is the physiological process by which cells break down organic molecules to produce energy in the form of ATP. Oxidation is a key part of respiration, but it is not the only process involved. Photosynthesis is the process by which plants produce glucose, not ATP. Nitrification is a process involved in the nitrogen cycle, not the production of ATP. Therefore, the correct answer is C, respiration.