How was the Solar System formed?

In my previous post, I told that How was the the Solar System was formed?. Now let's see "How life was formed on Earth". So let's continue.

Ans.

3.8 billion years ago

FIRST SPARKS OF LIFE

After some years when Asteroid Bombardment stopped, then life got a chance to born. but there was an problem. Because of constant asteroid impacts, The Earth was is molten State. Due to in liquid state, denser elements sank at bottom and lighter at top. This led to formation of Layers of Earth and eventually crust that we live on. During formation of layers, the gases that were rising were least dense, so they formed The Atmosphere. But it was very toxic to support life because it contained-Carbon Monoxide, Carbon Dioxide, Methane, Nitrogen, Cyanide and water vapor. Because of asteroid bombardment, heat that was produced made water in gaseous state, so because of no asteroids, water in atmosphere condensed and rained on Earth for first time. By the time it rained so much it covered The whole Earth. At that time, there was no crust but only shallow bowl shaped islands contains water consisting of amino acids, fats and other components of life. This soup is called primordial soup was jolted by lightning and meteor impacts.

 2.5 billion years ago

CLEARING THE AIR

First single celled bacteria called "cyanobacteria' evolved from primordial soup. These were the first bacteria on Earth and.They are still found on Earth in Water Bodies as Blue Green Algae. They had The power of Photosynthesis through which plants produce Oxygen (O2) by using Carbon Dioxide (CO2) and Sunlight with the help of a process called photosynthesis. These are prokaryotic cell (cell lacking of nucleus and other organelles).By the time Oxygen-an important breathable gas for evolution of a grater variety of life forms-began to increase in Earth's atmosphere.

1 billion years ago

LIFE LEVELS UP

 The first multicellular life forms appeared in oceans.A cell is the basic unit of life; multi-celled organisms are made of colonies of cells that specialize in different functions.(Your body is made of trillion cells).

550 million years ago

 LIFE EXPLODES

Life underwent a boom in diversity-a period known as the Cambrian Explosion. Before this time, all life forms were squishy:boneless, toothless and without shells. But creatures during The Cambrian Explosion -are still limited to the oceans-toughened up to swim, burrow and hunt. they developed hard parts, such as simple shells, to defend themselves. Ancestors of fish, snails, octopuses, squids and crabs and bugs appeared in the ocean, along with the first simple vertebrates(animals with backbone).

260 million years ago

DINOSAUR DOMINATE

All of the Earth's continent-or landmasses-had joined into one supercontinent known as Pangea. Its hot, dry interior was a, paradise for reptiles, which grew in size. The first dinosaur-a plant eating creature no larger than a kangaroo-showed up on the fossil record 240 million years ago. Dinosaur exploded in diversity. As pangea started to break around 220 million years ago, dinosaur spread to every continent on Earth.They reigned for nearly 150 million years ago.

150 million years ago

EARLY BIRDS

 The first birds called Archeopateryx -which evolved from 2 legged meat eating dinosaur-took to the skies on the feathery wings. With their reptilian tails, sharp beaks, arm claws, these early birds weren't as pretty as their descendants are today.

65 million years ago

DEATH OF DINOSAURS

Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.

60 million years ago

RISE OF MAMMALS

The sudden death of dinosaurs-likely from an asteroid impact-left a void for smarter, smaller creatures to fill. Enter the Mammals. These furry creatures lived underfoot of the dinosaurs for nearly 150 million years, but suddenly the world was theirs. Mammals grew in size and diversified into many species we know today:cats, dogs, horses, bats, rats, and tree dwelling primates.(the order of animals that eventually gave rise to gorillas, chimpanzees, and humans.

Between 13 to 6 million years ago

DOWN TO EARTH

The common apelike ancestors of humans and chimpanzees(our closest living relative today) climbed down from the trees and and eventually evolved to walk on 2 legs. Not long after, hominids appeared and branched of from the lineage that gave rise to chimps. Hominids include humans and our immediate ancestors(such as homo erectus)and close relatives The Neanderthals.

200,000 years ago

THE BEGINNING OF HUMAN BEINGS

Finally we arrived on the fossil record. The first HOMO SAPIENS -which means 'thinking man"-appeared in eastern Africa. In tribes of hunter and gatherer, we left the mother continent around 140,000 years later, eventually spreading to every corner of the World while leaving the less evolved "Homo Erectus" in our evolutionary dust. Our relatives the Neanderthal died out, possibly because humans hunted them for food our started families with them. Today, the humans are the only surviving hominids

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How life formed on Earth?

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