What were the primitive conditions on earth. Tell your friend/cousin/ colleague. Then ask your friend to name the gas which was absent without which today no life can exist.
Answers
Answer:
It's oxygen.In the beginning the earth was very hot like molten lava. The proportion of oxygen in the atmosphere was very poor.
Me: Do you know about what we're the primitive conditions of the earth?
Friend: I have a little knowledge about it that whatever the atmosphere was, it wasn't suitable for any life form to exist.
Me: Yes, you are correct because earlier earth was a hot ball with constant volcanic eruptions and the environment was ladened with toxic gases like carbon dioxide, carbon monoxide, ammonia, etc. Due to the absence of any protective layer around it, the earth was prone to meteorite attack and ultraviolet radiations from the sun.
Friend: That's why no living form could live at that time.
Me: Do you know that a very important gas which serves the main purpose for our living was absent at that time? Can you name it?
Friend: Yes, I know that oxygen wasn't present on earth at that time.