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Bacteria live and grow best in:

  1. cold places

  2. dry places

  3. dirty places

  4. clean places

The correct answer is: dirty places

Bacteria are known to thrive in moist environments, making option A incorrect. Additionally, since bacteria are microorganisms, they typically need dampness to survive, ruling out option B. While bacteria can sometimes be found in clean places, it is more likely for them to grow and multiply in areas with a buildup of dirt and waste, making option D incorrect. Overall, the ideal conditions for bacteria to live and grow are in dirty, damp places, making option C the correct answer.