When life first came about 3.5 billion years ago, there most likely was no oxygen in the atmosphere. This fact is indicated by iron in rocks formed during that time: in an oxygen environment, Fe2+ oxygenates to Fe3+, or rust. During that time, there was no evidence for rust.
Plants evolved out of a "primordial soup", a mixture of elements and some form of energy like light, geothermal heat, etc. Experiments have shown that, given the chemicals that we know to have been around during that time (CO2, H2O, NH3, H2, etc.), the basic units for life were produced. This includes amino acids, carbohydrates, fatty acids, and nucleobases.
The first plants formed from this primordial soup are thought to be the ancestors of green and purple algae. With the evolution of plants, CO2 fixation began and O2 evolution occurred. Thus, over several billion years, oxygen began to build up as plants grew in number and diversified.
Currently, nitrogen takes up about 78% of the air we breath, oxygen takes up 21%, and a variety of other chemicals like water and CO2 represent the remaining 1%. Our bodies don't need 100% oxygen; in fact, oxygen can be toxic in large doses.
When life first came about 3.5 billion years ago, there most likely was no oxygen in the atmosphere. This fact is indicated by iron in rocks formed during that time: in an oxygen environment, Fe2+ oxygenates to Fe3+ or rust. During that time, there was no evidence for rust.
Plants evolved out of a "primordial soup", a mixture of elements and some form of energy like light, geothermal heat, etc. Experiments have shown that, given the chemicals that we know to have been around during that time (CO2, H2O, NH3, H2, etc.), the basic units for life were produced.
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More than 2 billion years ago, Earth's early organisms released oxygen into the atmosphere.
The answer is oxygen.
1 percent of the earths atmosphere is made of the following: - Argon (0.93%) - Carbon dioxide (0.03%) - Neon> trace - Helium> trace - Methane> trace - Krypton> trace - Xenon> trace - Hydrogen> trace - Ozone> trace 21% of earths atmosphere is made of oxygen 78% of earths atmosphere is made of nitrogen
what atmosphere is 75 km away from earth
The earth's atmosphere is composed as follows:nitrogen: 78%oxygen: 21%argon: 0.9%trace gases make up the remaining less than 0.1% - these include carbon dioxide, neon, helium, methane, krypton, and hydrogen, and the barest amounts of many others
Earth's atmosphere is mostly made up of nitrogen, which makes up 79 percent. The atmosphere contains 20 percent oxygen and 1 percent other gases.
the percentage of oxygen in the atmosphere today is about 20.95%. Or... if you round it you get the most common answer of 21%.
1 percent of the earths atmosphere is made of the following: - Argon (0.93%) - Carbon dioxide (0.03%) - Neon> trace - Helium> trace - Methane> trace - Krypton> trace - Xenon> trace - Hydrogen> trace - Ozone> trace 21% of earths atmosphere is made of oxygen 78% of earths atmosphere is made of nitrogen
Oxygen makes up 21% of the Earths atmosphere.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
The most prominent gases are nitrogen (78 percent), oxygen (21 percent) and argon (nine-tenths of a percent).
oxygen . hey people googling there science hw. join the club :)
No - out atmosphere is made up of approximately 78% Nitrogen, 21% Oxygen and 1% other gasses.
78% nitrogen gas 21% oxygen gas
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
21% of the atmosphere is oxygen.
mostly nitrogen with 21% oxygen
what atmosphere is 75 km away from earth