An organelle found in most eukaryotic cells described as "cellular power plant"

Explanation:

The mitochondria is commonly called the powerhouse of the cell.

This is because it is the organelle that makes energy for the cell. The process of cellular respiration occurs in the mitochondria.

Cellular respiration turns glucose from food and oxygen into carbon dioxide, water, and ATP. ATP is useable energy for the cell, its metabolism, and its processes.

Mitochondria are found in eukaryotic cells, because it is a membrane bound organelle.

So, the organelle this question describes is the mitochondria.

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oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%