Which term would most accurately describe a microorganism that thrives in extremely hot environments?

• A. Evolution
• B. Energy
• C. Dissolved Organic Carbon
• D. Extremeophile

Answer: (D)

Extremophile describes a microorganism that grows best in extreme environmental conditions, such as very high temperatures. These organisms, called thermophiles or hyperthermophiles, have adaptations that keep their proteins stable and their membranes intact at heat levels that would denature most life, enabling metabolism to proceed in hot environments like volcanic vents or hot springs. The other terms aren’t descriptive of organisms: evolution is a process of change over generations; energy is a concept describing how life uses resources; dissolved organic carbon is a nutrient pool. So the best term for a microbe thriving in extreme heat is extremophile.