[Answer] What gas makes up 95% of Mars’ atmosphere?

Step 1 : Introduction to the question "What gas makes up 95% of Mars’ atmosphere?"

...Like Earth, Mars has a unique atmosphere, which is 95% carbon dioxide, 3% nitrogen, 1.6% argon, and trace amounts of water, carbon monoxide, and methane. Earth’s most plentiful atmospheric gasses, by contrast, are nitrogen (78%) and oxygen (21%), creating a habitat that supports organic life.

Step 2 : Answer to the question "What gas makes up 95% of Mars’ atmosphere?"

Carbon dioxide:

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