Organisms are classified based on the temperature ranges in which they thrive: - Thermophiles: Thrive at high temperatures, typically between 45°C and 80°C, with some extreme thermophiles living above 80°C. - Mesophiles: Thrive at moderate temperatures, typically between 20°C and 45°C. Most human pathogens are mesophiles. - Psychrophiles: Thrive at low temperatures, generally between 0°C and 20°C, with optimal growth often below 15°C. They are found in cold environments like polar regions, deep seas, and high mountains. - Psychrotrophs: Can grow at low temperatures (e.g., refrigeration temperatures around 4°C) but have optimal growth at moderate temperatures (e.g., 20-30°C). The temperature range 0-15°C clearly falls within the typical range for psychrophiles.