Question

The main constituent of the Martian atmosphere is:

A: nitrogen.
B: hydrogen.
C: helium.
D: methane.
E: carbon dioxide.

Answer 1

The main constituent of the Martian atmosphere is carbon dioxide (CO₂).

Step-by-step explanation:

The main constituent of the Martian atmosphere is carbon dioxide (CO₂). The atmosphere on Mars is composed of about 95% carbon dioxide, making it the dominant gas. Other gases present in lesser amounts include nitrogen, argon, and traces of oxygen, carbon monoxide, and water vapor. However, carbon dioxide is the primary and most abundant gas in the Martian atmosphere.