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Elemental oxygen did not appear on Earth until some time after life did. In fact, the oxygen was produced by life carrying out photosynthesis. The first organisms on Earth were anaerobic, meaning their life processes did not involve oxygen. To most organisms like this, oxygen was highly toxic.
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Why is oxygen such an important part of the earth's atmosphere?
Oxygen is necessary for most organisms to carry out their life functions.
What effect did photosynthetic cyanobacteria have on earth's environment?
Photosynthetic cyanobacteria were the first organisms to produce oxygen. The effect of their oxygen production was that the earth became an environment which was suitable for life.
How would life on earth be different if the atmosphere were eighty percent oxygen?
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What element is life on earth based on?
Life on Earth is carbon-based. Carbon forms bonds with hydrogen and oxygen to create organic compounds. It is also often said that all life depends on water, meaning that all life requires the hydrogen and oxygen atoms too.
Why is earth capable of supporting life?
because plants give off oxygen and support life for us and we have water.
Before there was any life on earth which gas was absent from earth's ancient atmosphere?
oxygen
What were four events that had to happen before life could form on earth?
Before the first life? The first life was Eukaryote cells but before them the Earth was a hot molten rock with lava on it.
How does oxygen make life sutable on earth?
Oxygen makes it human capable of breathing in earth that's why when there is oxygen, there is life.
Effects of no oxygen on earth?
Oxygen is main gas of earth. If there is no oxygen in the earth all the life in the earth should die.
What was the earth's atmosphere like before photosynthesis?
Without life because when plants do photosynthesis, they produce oxygen.
Which gas in Earth's atmosphere suggests that there is life on Earth?
The gas in earths atmosphere that suggests that there is life on Earth is oxygen. However carbon dioxide also shows that there is life on Earth.
Why does oxygen occur naturally?
It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.
How are the carbon oxygen and nitrogen cycles vital to sustaining life on earth?
Carbon, oxygen, and nitrogen are vital components of life on Earth
Where does oxygen come from and why is it important to life on earth?
Oxygen is important as it the breathing sources. It also forms ozone which is vital for life on earth.
Which gas in earth's atmosphere tells us that there is life on earth?
Oxygen, Nitrogen and Carbon dioxide, in that order. The most important element to sustaining life is Oxygen.
Why do you consider life possible only on planets where there is oxygen?
This is a false presumption. The life that exists on Earth now is dependent on oxygen, but it was not always so. Life on Earth emerged long before there was any noteworthy amount of oxygen. In fact oxygen was highly toxic to the first organisms. Oxygen began to build up in the atmosphere when cyanobacteria began carrying out photosynthesis, which uses sunlight to convert water and carbon dioxide into sugar and oxygen.
Which Gas that is needed for life on Earth?
Oxygen
