Question

multiple choice question
what are the extraordinary life forms known as \cryptoendoliths\ found in the antarctic desert, and where do they live?
a. organisms that utilize hydrocarbons instead of water, found in deep - sea vents.
b. microbial life that is hidden inside of rock, with photosynthetic organisms using energy from the sun.
c. dormant microbes in permafrost that are similar to bears in hibernation.
d. bacterial populations found thriving in volcanic settings in hawaii.

Explanation:

Cryptoendoliths are microbial life forms. The term "crypto" means hidden, and "endolith" means within rocks. In the Antarctic desert, these are microbial communities (often including photosynthetic organisms like algae) that live inside porous rocks. They use sunlight (when available) for photosynthesis.

• Option A: Hydrocarbon - utilizing organisms in deep - sea vents are a different type of extremophile (not cryptoendoliths). Deep - sea vents are underwater, not in the Antarctic desert.
• Option C: Dormant microbes in permafrost (like in Arctic permafrost) are not cryptoendoliths. Cryptoendoliths are active (at least when conditions allow, e.g., during Antarctic summer) and live within rocks.
• Option D: Bacterial populations in volcanic settings in Hawaii are not related to Antarctic cryptoendoliths.

Answer:

B. Microbial life that is hidden inside of rock, with photosynthetic organisms using energy from the sun.