0
By 3.8 billion years ago the impacts relented. Liquid water could persist. About that time, perhaps in the oceans, lifeless chemical reactions crossed a threshold, producing molecules complex enough to reproduce themselves and evolve toward greater complexity. Life was on a road that led, as early as 3.5 billion years ago, to single-celled, blue-green cyanobacteria that flourished in the sunlit parts of the oceans. By the trillions, these microscopic organisms transformed the planet. They captured the energy of the sun to make food, releasing oxygen as a waste product. Little by little they turned the atmosphere into breathable air, opening the way to the diversity of life that followed.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
Where can disabled drivers park?
Where a disabled sign is shown
What Egyptian sign of life?
th egyptian sign of life is ankh
Where did sign your John Hancock come from?
John Hancock was the first to sign the United States Declaration of Independence - hence sign your John Hancock. Actually, John Hancock was not the first to sign, signed his name largest. He was the President of the Continental Congress, but not the first to sign.
Who was the First person to sign declaration of inderpendence?
The first person to sign the declaration of Independence was John Hancock
Why did men risk there life to sign the declaration?
Men risked their life to sign the declaration of independence, because they wanted their independence as a nation, and believed they would get it.
What is an invisible math sign?
This could refer to the plus sign (+) which is not shown before the first term in an expression. For example, "5 -3" is "+5 -3".
Where does the addition sign effect you in real life?
The Addition Sign or "Plus Sign" (+) is often more implied than shown. For example, stores list individual prices, with the implication that customers know that they must add prices together.The "plus" sign is also shown on:websitesstore adsstore offers (example: "Buy One + One Free")
Which should you check first signs of life or a pulse?
first sign of life
What is Virgo 's sign?
Virgo's sign is the virgin, often shown as a maiden.
What is Gaea's symbol?
Gaea's symbol looks like a cross in the middle and then something around it!!! :)The symbol can't be shown here, but it looks like a circle with a "+" sign inside it.Circle with a "+" sign inside it.The earth and fruits =)
What was the first sign of life in water?
fish or dinosaurs = ages ago
What was the first sign of independence in the eights life?
doing volunteer hours
What is the only planet known to be inhabited?
Earth is the only planet known to have life. Astronomers have found no other sign of extra terrestrial life.
Where can disabled drivers park?
Where a disabled sign is shown
Is there any other planet with sign of life?
There isnt an exactly existance on any other planet than Earth
Do aliens live on the planet mars?
No. There is no evidence of life on Mars.
What year earth was made?
The earth was made way back 4. 54 billion years ago by augmentation from the solar nebula. The first sign of life on earth was found in Western Greenland and it is a graphite that is found to be biogenic.
