In contrast to Earth,reasons oxygen does not exist in any quantity in the Martian atmosphere could be because
A) there were never plants to convert carbon dioxide to oxygen like on Earth.
B) most of the oxygen is chemically combined with iron giving Mars its red color.
C) the element oxygen is not found alone or combined chemically with hydrogen on Mars.
D) both answers b and c
E) both answers a and b

Question

Quizplus · Accepted Answer

Mars lacks plant life to convert CO2 to oxygen, and most of its oxygen is bound with iron, giving the planet its red color.

In Contrast to Earth,reasons Oxygen Does Not Exist in Any