Current estimates are that life emerged on Earth between 3.5 and 3.8 billion years ago, but it may have emerged even earlier than that.
Life, according to our best hypotheses, emerged almost as soon as the conditions were favourable. Before that, the planet's surface was simply too hot, its atmosphere and surface conditions too corrosive. After all, the planet was still cooling down and outgassing following its coalescence from interplanetary debris.
The latest evidence suggests it took less than a billion years for life to first appear, though it still took a few hundred million years. Prior to that Earth was either too hot or two frequently hit by giant asteroids for life to gain a foothold.
Oxygen released by life was removed from the atmosphere by chemical reactions with surface rocks until the surface rock could absorb no more.
Oil is formed by degradation of living organisms.
Many rocks can contain fossil organisms. Generally speaking, sedimentary rocks are the rock type that contains the most fossil organisms. Coquina, a type of limestone, is formed nearly completely by the shells of marine organisms. And coal is a sedimentary rock composed of the remains of ancient swamp plants.
Probably 4 billion years (out of 4.5 billion total), but the simplest ones don't leave much of a record. ------------------------------------------------------------------------------------------------------------- Simple organic compounds can be seen is space dust in distant nebulae, an are to be found in certain (contrite) meteorites which formed in the planetary nebular from which the earth condensed. Therefore they must have been present on earth as it formed.
consist of organisms and the non living things.
Soil is formed from a set of several independent factors: climate, living organisms, the parent material, topography, and time.
The first known were bacteria, and they date back to 3.5 to 4 billion years ago.
Any link of uranium with the living organisms.
No. Cells only exist in living organisms. materials are made out of billion and billion of atoms and molecules.
a
Dead organisms that were living million / billion/S of years ago.
A fossil fuel is a natural fuel such as gas or coal. It is formed from living organisms remains.
Different parts of living organisms are formed as the genetic information is read. This controls how and when various parts are constructed as the organism develops.
Fossil Fuels =)
sedimentary rock
Ecosystem
Fossil Fuels =)
this would be organic sedimentary