QUESTION:
What is the atmosphere of Mars made up of?

ANSWER from the Internet:
LFM Web pages - http://qust.arc.nasa.gov/mars/background
The atmosphere of Mars is broken down as follows:
95.32% Carbon Dioxide - CO2
 2.7% Nitrogen - N2
 1.6% Argon - Ar
 0.13% Oxygen - O2
 0.07% Carbon Monoxide - CO
 0.03% Water - H2O
 0.00025% Neon - Ne
 0.00003% Krypton - Kr
 0.000008% Xenon - Xe
 0.000003% Ozone - O3