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20.9 % (almost 21%)
Half a billion years ago the percentage was higher (in the mid-30s) due to abundant plant life. Before photosynthesis evolved, atmospheric oxygen was close to zero & poisonous to the earliest cells.
it is 21% oxygen,that is ok because it isn't good to breathe pure oxygen
What else can I help you with?
How has the earths atmosphere changed?
The earths atmosphere has significantly altered over the years. The process of the earth's atmosphere was recognized and evolved 2.7 billion years ago, forming the nitrogen-oxygen atmosphere that exists today. This change enabled the formation and beginning of the ozone layer (which along with magnetic fields) block solar radiation.
How do humans breathe Oxygen?
Yes. The air is 21% oxygen which is what humans run on. It is 79% nitrogen which we filter out. I learned this today in Health class.
Why did the earth's atmosphere change after it was first formed?
The earths atmosphere has significantly altered over the years. The process of the earth's atmosphere was recognized and evolved 2.7 billion years ago, forming the nitrogen-oxygen atmosphere that exists today. This change enabled the formation and beginning of the ozone layer (which along with magnetic fields) block solar radiation.
When did oxygen levels start to rise on Earth?
After the earth was created, there was just one gigantic ocean. At some point, single-celled organisms formed - the first plants. They made their own energy using the sun and carbon doixide (photosynthesis) and one of the waste products was oxygen. As they multiplied, more and more oxygen was produced, forming the start of today's atmosphere.
Why is it important to know the difference between science and pseudoscience?
because science is what makes organisms what they are today, and idrk what the other word is so figure it out yourself
How much percent oxygen present in your atmosphere?
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%.
What is a gas that was probably abundant in earths atmosphere 3.6 billion years ago and is still abundant today?
Oxygen
What was the percentage of oxygen in prehistoric times?
It was about 60% higher than the 21% that is today. This is a reason for large animals that are today smaller due to lower amounts of oxygen in the atmosphere. Living things usually grow faster in higher percentages of oxygen.
What do you think earths atmosphere would be like today if life had not evolved on earth?
Almost no oxygen, lots of CO2, still mostly nitrogen.
How was oxygen added to the earths atmosphere?
Oxygen was added to Earth's atmosphere through the process of photosynthesis by early photosynthetic organisms like cyanobacteria. These organisms released oxygen as a byproduct, which accumulated over millions of years and eventually led to the oxygen-rich atmosphere we have today.
Why earths atmosphere today contains more oxygen than earth atmosphere?
The increased oxygen levels in Earth's atmosphere today compared to earlier in its history are due to the evolution and proliferation of photosynthetic organisms like plants and cyanobacteria. These organisms release oxygen as a byproduct of photosynthesis, gradually increasing its concentration in the atmosphere over millions of years.
What is earths temperature today?
it is 65
What are the main gases in earths atmosphere today?
The main gases in Earth's atmosphere today are nitrogen (about 78%) and oxygen (about 21%). Other important gases include argon, carbon dioxide, and trace amounts of water vapor, methane, and ozone.
Why is the percentage of argon in the earths atmosphere today the same as it was in the earths early atmosphere?
Argon is a noble gas and does not react with other elements in the atmosphere, so it has remained relatively constant over time. The initial percentage of argon in the Earth's atmosphere was likely determined by the gases present during the planet's formation. The lack of significant processes that remove or add argon to the atmosphere has helped to maintain its percentage over time.
What produced oxygen in earths atmosphere?
Oxygen in Earth's atmosphere was produced through the process of photosynthesis by cyanobacteria and early algae, starting around 2.5 billion years ago. These organisms converted carbon dioxide and water into glucose and oxygen using sunlight as an energy source. This oxygen began accumulating in the atmosphere and eventually led to the development of the oxygen-rich atmosphere we have today.
Why does earths atmosphere today contain more oxygen then the early earth?
The increase in oxygen in Earth's atmosphere is mainly due to the evolution of photosynthetic organisms like cyanobacteria and plants, which produce oxygen as a byproduct. Over time, these organisms gradually increased oxygen levels through the process of photosynthesis. This led to the rise of oxygen in the atmosphere from less than 1% to the current level of around 21%.
How is Biogeochemistry used today?
biogeochemistry is used by earths atmosphere
