3. Most living organisms cannot survive at temperatures above 450C. How are some microbes able to live in habitats with temperatures exceeding 1000C?
Some microbes can survive in temperatures as high as 1000C because these microbes are adapted to live at high temperatures. These organisms contain thermo-resistant enzymes which can work at high temperature. This is why they can be found at thermal vents, hot springs etc. The organisms which are unable to survive high temperatures have enzymes that gets deactivated at high temperatures.