Question

Write important of oxygen in atmosphere?​

Answer 1

Explanation:

About 21% of Earth's atmosphere is oxygen. ... Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things. We humans, along with many other creatures, need oxygen in the air we breathe to stay alive.

Answer 2

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$:::\mapsto$ About 21% of Earth's atmosphere is oxygen. This hasn't always been the case, though. Early in our planet's history, the atmosphere had almost no oxygen. Microbes that produce their food via photosynthesis generate oxygen as a by-product.

$:::\mapsto$ Oxygen from photosynthetic microbes eventually built up in the atmosphere, drastically changing our planet's environment and the history of life in the process.

$:::\mapsto$ Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things.

$:::\mapsto$We humans, along with many other creatures, need oxygen in the air we breathe to stay alive. Oxygen is generated during photosynthesis by plants and many types of microbes. Plants both use oxygen (during respiration) and produce it (via photosynthesis).