Do all living things need air to live?

Answer 1

Not all living things need air to survive. Do you like cakes? The yeast used to make them is a fungus that hates air and is a close relative to the yeast that gives us beer.

Many living organisms need air for the oxygen which enables them to use the Calvin Cycle.

There are also organisms that go through chemosynthesis at the volcanic vents at the sea floor. The vents provide many different chemicals and elements (mostly sulfur) that various organisms will use to provide energy for cell respiration. They do not need "air" or even sunlight.

Most living things use oxygen in the chemical process that releases energy from food.