How our earth came up as living planet? - Arrival of humanity - truesciencebehindscience

Dinosaurs ruled on earth for about 165 million years. But how did dinosaurs become extinct? What was the cause of their extinction? The most important question how humans came on earth? All these questions will be answered today. So, let us wear our time travel suit and travel to the past with science behind science-

About 65 million years ago, an asteroid was approaching the earth as it came under the gravity of earth its speed increased tremendously to 70,000 km/hr.  This asteroid was not a normal one it had a diameter of 10km. As it enters the earth's atmosphere due to friction it turns to a fireball. Its luminosity was at that peak that a big flash-bang was thrown on the earth. It almost blinded all the organisms who were in a radius of 1000 km from the spot. Dinosaurs couldn't see that incident but they could feel the heat. The great destruction had begun.

The asteroid hit the surface of the earth. Now, this spot is called the Chicxulub crater today in Mexico's Yucatan Peninsula. Every organism in the radius of 1000km from the spot got vaporized due to gigantic energy released from the collision. The collision was so much power that the earth's metric tonnes of matter just blew into space. The area collision built a crater of 180km in diameter and 20km deep. Due to this great collision, the tectonic plates of earth got affected with this and a tremendous earthquake was on its way with a gigantic tsunami. These disasters killed other left dinosaurs. Till now most of the land dinosaurs were killed. Flying dinosaurs somehow managed to save their life. 

But later, After the collision metric tonnes of matter which blew into space came under the effect of gravity. After 40 minutes every particle which left earth due to collision came back because of gravity. The earth was hit by a rain of fire that killed the flying dinosaurs too. That was not also enough, an enormous dust storm also became the cause of extinction. The dust storm was that thick that the rays of the sun couldn't pierce it and come out. After 90 minutes of collision earth's temperature was almost 150°C which led to the complete extinction of dinosaurs. Later, this dust storm covered the earth for few years which led to the extinction of most of the plants on earth. 

This extensive destruction killed most of the life on earth. But it became a great opportunity for some organisms called mammals to arise. These small mammals somehow survived the great destruction. These small mammals started living under the ground and started eating anything. 

Some million years later, the flowering plant dominated the earth because the pollen grains could survive in harshest conditions. In comparison with the non-flowering plant, they were not able to reproduce to that extent. The small mammals started evolving and the weight of the organisms also increased with time. But, till now these mammals were not much similar to homo sapiens because these mammals had to evolve into different species.

About 4 million years ago, A new mountain range started forming in East Africa namely the East African Rift valley this led to the blockage of monsoon winds. Due to this, the Apes who lived on trees got affected because fewer monsoon rains led to the scarcity of plants and fruits. Without rain, the complete jungle was deserted. Therefore, the apes had no food. So, our ancestors namely Ardipithecus ramidus came to land for the search of food. This evolution made the humans.

After the evolution of a few hundred years, our ancestors started walking on 2 legs. This led to the increased cranial capacity in them. Their cranial capacity was increasing with evolution. With the flow of time, they started using stones as their tools for which made hunting easier. The fire was discovered, the use of fire was determined. Eating fire-cooked food took less energy compared to raw one. Their cranial capacity was increased more.

Our ancestors Homo erectus started living in colonies and they developed language too. They used different tones as language. This language was later evolved into many other languages. About 200 thousand years ago our ancestors evolved into Homo sapiens. We are actually Homo sapiens only. We had weapons, language, and the most important our brain which was the most efficient brain among any other organism.

Human face evolution

Let's come back to the present, This endless evolution is continuous, today also we are evolving and in the future also we will be evolving. I think now you all know how humans are on this planet.

We had completed our journey in just three posts. How was this series comment it below! If you want to read any one of them click the below links.

ALSO READ THIS: How our earth came up as a living planet? - First organism born - truesciencebehindscience

ALSO READ THIS: How our earth came up as a living planet? - Arrival of dinosaurs - truesciencebehindscience

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HAIL MOTHERLAND