[Answer] What is Mars' atmosphere mostly made of?

Step 1 : Introduction to the question "What is Mars' atmosphere mostly made of?"

...1. Oxygen 2. Carbon Dioxide 3. Methane 4. Helium

Step 2 : Answer to the question "What is Mars' atmosphere mostly made of?"

Carbon Dioxide - If you were to fly to Mars, you'd have to keep your space suit on once you reached your destination. That's because Mars doesn't have air that we can breathe — the planet is light on oxygen and heavy on carbon dioxide. Interestingly, Mars is very cold. While carbon dioxide is causing global warming on Earth and is also responsible for the runaway "greenhouse effect" that keeps the surface of Venus terrifyingly hot, scientists think carbon dioxide keeps Mars a bit warmer than it otherwise would be, but the low atmospheric pressure there counteracts the effects and keeps Mars chilly.:

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