0
It is estimated that the first life forms on earth were primitive, one-celled creatures that appeared about 3 billion years ago. That's pretty much all there was for about the next two billion years. Then suddenly those single celled organisms began to evolve into multicellular organisms. Then an unprecedented profusion of life in incredibly complex forms began to fill the oceans. Some crawled from the seas and took residence on land, perhaps to escape predators in the ocean. A cascading chain of new and increasingly differentiated forms of life appeared all over the planet, only to be virtually annihilated by an unexplained mass extinction. It would be the first of several mass extinctions in Earth's history.
Scientists have been looking increasingly to space to explain these mass extinctions that have been happening almost like clockwork since the beginning of "living" time. Perhaps we've been getting periodically belted by more space rocks (ie. asteroids), or the collision of neutron stars happening too close for comfort? Each time a mass extinction occurred, life found a way to come back from the brink. Life has tenaciously clung to this small blue planet for the last three billion years. Scientists are finding new cues as to how life first began on earth in some really interesting places - the deep ocean.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoprobably the turtles. while lots of people think its the dinosaurs scientist have proof its the turtle
Wiki User
∙ 11y agoThe earlest is in1820
Wiki User
∙ 12y agoBirds and sea creatures.
Anonymous
Single cells
Add your answer:
Earn +20 pts
What was one of the earliest form of life?
Stromatolites are one of the earliest known life forms; some fossils may date back 3.5 billion years - before Earth had any oxygen in it's atmosphere.
What was the earliest form of all life?
Cyanobacteria.
Among the earliest life forms on earth?
Cyanobacteria
Among the earliest life-forms on Earth?
cyanobacteria
What is The earliest life forms on earth lived?
The earliest ones still around are stromatolites, but there were lots of earlier life forms.
Why have paleontologist not found any rock from the earliest years of earth existence?
It was to hot for rocks to form
What was the earliest form of multicelluar life on earth?
All land animals evolved from under the water. I would say fish and ammonites.
Did the earliest life forms of earth live on land or water or air?
The prevailing theory of the origin of life on earth posits that it began in the oceans.
What were the earliest life forms on the earth?
The earliest life forms were mostly different kind of bacteria and plants and other organisms.
The earliest life forms on earth lived where?
The earliest forms of life were microscopic autotrophs that lived in the great prehistoric oceans. Living under the water protected them from the deadly UV rays from the sun, as at this point Earth had not developed a suitable atmosphere. This is true everywhere but Kansas, where the earliest life forms were Adam and Eve. Zing!
Why have paleontologist not found any rocks from the earliest years of Earth?
It was to hot for rocks to form
What were the earliest lifeforms on earth like?
The earliest lifeforms that were found on Earth, were called prokaryotes. Prokaryotes are groups of organisms without a membrane bound nucleus. They are most commonly seen in the form of bacteria.
