Respuesta :
As Venus and Mars lost most of the liquid water they initially had, carbon dioxide was not dissolved in the water and thus not converted to sediments, and therefore it stayed in the atmosphere.
Carbon dioxide was probably brought to Venus and Mars within meteorites and asteroids. Carbon dioxide was probably produced as a byproduct of respiration from ancient bacteria that used to inhabit Venus and Mars.
The carbon dioxide concentration in the atmosphere of Earth has never been as high as that of Venus or Mars. Due to the presence of liquid water on Earth, much of the planet's original carbon dioxide was dissolved and changed into sediments like limestone. The temperature on Earth is ideal for the processes that decompose carbon dioxide.
The question is incomplete, the complete question is:
propose an explanation for the nearly pure carbon dioxide atmospheres of venus and mars. (select all that apply.)
a)carbon dioxide was probably produced as a byproduct of respiration from ancient bacteria that used to inhabit venus and mars.
b) carbon dioxide was probably brought to venus and mars within meteorites and asteroids.
c) carbon dioxide was probably released from molten rocks during lava flows.
d) carbon dioxide was not dissolved in the water and thus not converted to sediments, and therefore it stayed in the atmosphere
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