Both Venus and Mars have carbon-dioxide atmospheres. The Earth also started with a carbon-dioxide atmosphere but the development of anerobic bacteria produced oxygen as a waste-product which eventually altered the atmosphere and killed off the bacteria but allowed other types of organism using oxygen to develop, and that eventually led to animal life.
Venus Earth Mars
Oxygen and CO2 or carbon dioxide.
Venus and Mars haveatmospheres mostly consisting ofcarbon dioxide.
There are two such planets, Mars and Venus. Venus has a much thicker atmosphere than Mars, but both atmospheres are about 95% carbon dioxide.
venus (closer to 97%)
carbon dioxide
Venus Earth Mars
Oxygen and CO2 or carbon dioxide.
Venus and Mars haveatmospheres mostly consisting ofcarbon dioxide.
It is Venus.
There are two such planets, Mars and Venus. Venus has a much thicker atmosphere than Mars, but both atmospheres are about 95% carbon dioxide.
Mars and Venus
Probably. Carbon dioxide is a fairly stable gas, formed from common elements, so it's likely that CO2 will be found on most planets.
carbon-dioxide, methane, ammonia,carbon-monoxide, helium et cetera make up the gas giants or jovian planets
venus (closer to 97%)
Because of the rock and carbon dioxide
Mars and Venus are both planets that have atmospheres composed mostly of carbon dioxide.