Origin of Life

Do you ever think how life begun on our planet ‘Earth’. Today, We tell you about the origin of life on earth which came into existence about 3.8 billion years ago from the present time.

Evolution of life on the earth

The evolution of the Earth relates to the origin and evolution of life. It is undoubtedly clear that initially the Earth or even the Atmosphere of the Earth was not conducive for the development of life. Modern scientists refer to the origin of life as a kind of chemical reaction, which first generated complex organic molecules and assembled them. This assemblage was such that they could duplicate themselves converting inanimate matter into living substance. The record of life that existed on this planet in different periods is found in rocks in the form of fossils. The microscopic structures closely related to the present form of blue algae have been found in geological formations much older than some 3,000 million years. It can be assumed that life began to evolve sometime 3,800 million years ago.

Origin of life in the Ocean water by Chemical Reaction

Life on Earth ( Time Scale )

Period	Age/ Years Before Present	Life / Major Events
Quaternary	0 – 10,000 10,000 – 2 million	Modern Men. Homo Sapiens.
Tertiary	2 – 5 million 5 – 24 million 24 – 37 million 37 – 58 million 57 – 65 million	Early Human Ancestor. Ape : Flowering Plants and Trees. Anthropoid Ape. Rabbits and Hare. Small Mammals : Rats – Mice.
Cretaceous Jurassic Triassic	65 – 144 million 144 – 208 million 208 – 245 million	Extinction of Dinosaurs. Age of Dinosaurs. Frogs and turtles.
Permian Carboniferous Devonian Silurian Ordovician Cambrian	245 – 286 million 286 – 360 million 360 – 408 million 408 – 438 million 438 – 505 million 505 – 570 million	Reptile dominate – replace Amphibians. First Reptiles: Vertebrates : Coal beds. Amphibians. First trace of life on land : Plants. First Fish. No Terrestrial Life : Marine Invertebrate
	570 – 2500 million 2500 – 3800 million 3800 – 4800 million	Soft – bodied arthropods. Blue green algae : Unicellular bacteria. Oceans and Continents form – Ocean and Atmosphere are rich in carbon dioxide.