All three statements regarding microorganisms are correct, highlighting the incredible adaptability of life forms in extreme environments. Extremophiles, a category of microorganisms, include thermophiles that thrive at high temperatures (including above 100°C), psychrophiles that flourish in subzero conditions, and acidophiles that can survive in highly acidic environments with pH levels below 3. Understanding these adaptations is crucial not only for biological sciences but also for applications in biotechnology, environmental science, and astrobiology, as they demonstrate the potential for life in extreme conditions beyond Earth.