Algae and later plants carried out photosynthesis, which uses sunlight to convert water and carbon dioxide into sugar and oxygen. This process removed carbon dioxide from the air and added oxygen. Additional carbon dioxide was removed and locked away in carbonate rocks such as limestone.
Humans would die of cold. A little carbon dioxide keeps the earth warm, through the greenhouse effect.
Algae and later plants used sunlight to convert water and carbon dioxide into carbohydrates and oxygen. Until about the middle of the Paleozoic oxygen went into the atmosphere faster than it could be removed.
Arteries carry blood away from the heart and veins carry blood into the heart. Blood moving from the heart to the lungs through the pulmonary artery has less oxygen than blood moving from the lungs to the heart through the pulmonary vein, but most arteries carry oxygen-rich blood with little carbon dioxide, and most veins carry deoxygenated blood with carbon dioxide and other wastes.
You're probably referring to three lakes in Central Africa, Lakes Nyos, Monoun, and Kivu. They periodically undergo what's called "lake overturn," also known scientifically as a limnic eruption. It's a rare set of circumstances: nearby volcanic activity, deep lakes, and an equitorial latitude. The nearby vulcanism means carbon dioxide (CO2) and methane (CH4) bubble up into the lakes' deepest regions. The CO2 dissolves in the water as a result of the increased pressure at that depth (CO2 won't dissolve in water near the surface.) The geographic location of the lakes means there isn't a lot of variance in temperature between seasons, so there's little convection current action going on in the lakes to mix things up. So, the carbon dioxide just accumulates down there, and something like a landslide or small earthquake can shake things up just enough to cause all that CO2 to erupt to the surface. This can cause locally destructive tsunamis, but even more deadly than that, the huge amount of carbon dioxide can blanket whole towns, suffocating people and animals. Carbon dioxide, at 44 grams/mole, is heavier than the mixture of air we breathe, so it doesn't disperse as quickly into the atmosphere. Limnic eruptions in this region have already proven deadly, and efforts are underway to try and "vent" excess CO2 from the lake bottoms before this happens again.
This depends on you definition of little. The best fit would probably be Mercury that has virtually no atmosphere and less than 40 % of Earth's gravity on the surface. (Until 2006 Pluto which has even less surface gravity was a planet as well but is now considered a dwarf planet)
mostly carbon dioxide with little or no oxygen.
Oxygen. Earth's early(first) atmosphere is believed to contain hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water. but still it only had little to no oxygen.
Jupiter is made of carbon dioxide gas and a little methane gas.
Jupiter is made up of carbon dioxide and little methane gas
Venus.
Jupiter is made up of carbon dioxide and little methane gas
Humans would die of cold. A little carbon dioxide keeps the earth warm, through the greenhouse effect.
There is no known way that humans can economically remove carbon dioxide from the atmosphere; all we can really do is reduce our emissions of carbon dioxide and slow down the rate at which atmospheric carbon dioxide levels are increasing. The surface waters of the ocean do absorb some carbon dioxide from the atmosphere as atmospheric carbon dioxide level increase, but there is little interchange betwen the warm upper ocean and the deep layers. However over a period of several thousand years, there is sufficient interchange to absorb large volumes of carbon dioxide, allowing the atmospheric concentration to return more or less to normal. Afforestation. Planting trees will remove carbon dioxide from the atmosphere.
If there were no plants it is unlikely that there would be any atmosphere at all. Plants remove carbon dioxide (CO2) from the atmosphere and are a vital part of the carbon cycle. No plants would mean huge increases of greenhouse gases in the air and a runaway greenhouse effect. Animals on the other hand would make little or no difference to the levels of carbon in the atmosphere.
Venus' atmosphere is made up mostly of carbon dioxide, it lacks oxygen, and it only has a little nitrogen. Carbon dioxide makes the atmosphere heavy, which makes the atmospheric pressure 90 times stronger than Earth's atmospheric pressure. The atmosphere of Venus is very hot and thick.
Venus is extremely dense atmosphere with mostly carbon dioxide and a little of nitrogen. this atmosphere is 93 times of the earth's atmosphere. Venus has thick cloud layer of sulpher dioxide which produce the rain of sulpheric acid. it is the night-mare indeed to be there.
Your thinking of Venus which does have a high Co2 atmosphere and sulphuric rain. Mars has very little atmosphere.