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Before there was oxygen life tended to exist in water as a form of algae which breathed in carbon dioxide and exhaled oxygen like plants. bacteria also existed at underwater thermal vents like the ones they have discovered at the ocean floor.
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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.
Give three examples from everyday life of how the atmosphere supports and protects life?
Some three examples of how the atmosphere supports and protects life includes blocking out harmful UV rays from the sun and balancing the carbon dioxide levels. Most life forms need oxygen to survive and this comes from the atmosphere.
If all life on Earth were to cease the atmosphere would revert to its primitive oxygen-poor composition and become poisonous to modern plants and animals?
true
What organism added oxygen to your atmosphere and why?
Plants, trees, and grass put oxygen into the air.
What does respiration remove from the atmosphere?
Carbon dioxide is being released. As you breathe in you inhale fresh oxygen, but as you breathe out your body releases carbon dioxide.
Is oxygen found outside earths atmosphere?
Yes. Earth's atmosphere is about 21% oxygen. Without it, the vast majority of life we see, including humans, could not exist.
What would have happened to the animals if there was no oxygen from the beginning?
There was no oxygen in the beginning. Plant life developed and released oxygen gas into the atmosphere over a long period of time.If that had never happened, there would not be much if any free oxygen in the atmosphere and aminal life as we know it would never have developed.
Can you name the gas that exist in the atmosphere that we cant live with out?
oxygen
What layer of the atmosphere does life exist?
The troposphere is the only layer where life can exist
Why was there life on earth but no life on venus?
Because Venus doesn't have oxygen. It's atmosphere is not as good as Earth's, instead of oxygen, Venus contains greenhouse gasses, carbon dioxide, and sulfur dioxide. The atmosphere on Venus is quite thick and because it is carbon instead of oxygen life can't exist on this planet including us humans, because in order to live you need oxygen. And without oxygen life cannot live on Venus. So the atmosphere is nothing like ours.
How did the oxygen in the atmosphere get there?
The oxygen in Earth's atmosphere has been generated, over geological time, by the plant 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 does the atmosphere preserve life on Earth?
There is oxygen in the atmosphere. This lets us breathe.
Why did miller and Urey try to keep oxygen out of their equipment?
Oxygen did not exist in the early atmosphere. Early life took in carbon dioxide and sunlight, exhaling oxygen as a waste gas. After a few million years, this waste gas became a significant part of the atmosphere, enough so that new opportunistic species could use it for respiration.
Can life exist on mars why or why not?
No life is known to exist there. It is too cold, too dry, and there is very little atmosphere.
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.
What do you need in atmosphere to sustain life?
oxygen and sunlight
