Question

How is the atmosphere of venus or mars different from that of earth?

Answer 1

Venus has a higher concentration of greenhouse gases, thereby increasing the temperature of the planet. Also, the planet is closer to the Sun, which wouldn't be enough to sustain life.

Answer 2

Earth's atmosphere is totally different from that of venus and mars.

In case of venus and mars atmosphere is mostly comprised with Co2. But Venusian atmosphere is 93 % HEAVIER than earth whereas Martian atmosphere is 100 times thinner thinner than earth. 

Heres the compositions.....

Earth :-

Nitrogen - 78%

O2 - 21 %

CO2 - 0.003 %

Venus:-

CO2 - 96.5%

remaining is almost nitrogen

Mars:-

Carbon dioxide: 95.32

Nitrogen: 2.7

Argon: 1.6

Oxygen: 0.13

Carbon monoxide: 0.08