Question

how life came into existance?​

Answer 1

$\huge\bold\red{Answer!}$

The age of the Earth is about 4.54 billion years; the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago.

There is evidence that life began in the earlier part of this one billion year range.

$\huge\bold\orange{Explanation!}$

The evolutionary history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to the present.

Earth formed about 4.5 billion years (Ga) ago and evidence suggests life emerged prior to 3.7 Ga.

Soon after the Big Bang, Primordial protons and neutrons formed from the Quark-

Gluon Plasma of the early Universe as it cooled below two trillion degrees.

A few minutes later, in a process known as Big Bang nucleosynthesis, nuclei formed from the primordial protons and neutrons.

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Answer 2

Answer:

hey dude here is ur answer.....

This is the story of our quest to discover our ultimate origin. It is a story of obsession, struggle and brilliant creativity, which encompasses some of the greatest discoveries of modern science. The endeavour to understand life's beginnings has sent men and women to the furthest corners of our planet. Some of the scientists involved have been bedevilled as monsters, while others had to do their work under the heel of brutal totalitarian governments.

This is the story of the birth of life on Earth.

Life is old. The dinosaurs are perhaps the most famous extinct creatures, and they had their beginnings 250 million years ago. But life dates back much further.

The oldest known fossils are around 3.5 billion years old, 14 times the age of the oldest dinosaurs. But the fossil record may stretch back still further. For instance, in August 2016 researchers found what appear to be fossilised microbes dating back 3.7 billion years.

The Earth itself is not much older, having formed 4.5 billion years ago.

If we assume that life formed on Earth – which seems reasonable, given that we have not yet found it anywhere else – then it must have done so in the billion years between Earth coming into being and the preservation of the oldest known fossils.

As well as narrowing down when life began, we can make an educated guess at what it was.

Since the 19th Century, biologists have known that all living things are made of "cells": tiny bags of living matter that come in different shapes and sizes. Cells were first discovered in the 17th Century, when the first modern microscopes were invented, but it took well over a century for anyone to realise that they were the basis of all life.

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