Please choose the correct answer to the question: Many bacteria are decomposer organisms. Which of the following statements best describes how these bacteria help make soil more fertile?

Answer1: The bacteria break down water into food. Answer2: The bacteria change sunlight into minerals. Answer3: The bacteria combine with sand to form rocks. Answer4: The bacteria break down plant and animal matter.

Answer format: answer1/answer2/answer3/answer4
Answer: answer4