Why is archaea anaerobic?

Answer 1

This is related with primordial atmosphere. Primordial atmosphere was without oxygen.

Life began on earth when there was no oxygen. The earliest organisms use to get energy from methane, carbon dioxide, and sulphur compounds. Archea origin was with such environment. There cells are without membrane bound organelles. Naturally these were anaerobic . When cyanobacteria developed oxygen was released in atmosphere by photosynthesis. This was beginning of aerobic organisms.

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Answer 2

Vivian Aronson

Archaea are not inherently anaerobic; rather, some archaea species can survive in anaerobic environments due to their ability to thrive in extreme conditions, such as high temperatures, high salinity, or acidic environments. Anaerobic archaea lack the ability to use oxygen for respiration and instead rely on alternative metabolic pathways to generate energy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.