Which of the following is not a habitat?
Surface of the Sun
Habitat is a region which provides a living organism with the food, shelter and water that it needs to survive.
Thermal springs are a habitat for many thermophilic bacteria.
The human intestines are host to a whole range of microorganisms that form the microbiome of the body.
Volcanoes have been found to be the habitat for some bacteria as well as micro-animals called Tardigrades.
The Sun's temperature is so high that it burns away any life that comes close to it. It is very unlikely that the Sun's surface serves as a habitat for microorganisms.