>>> 3- What is the latest estimate of the age of the earth, and consequestly the earliest life form? >> >>Sorry, but I forgot. I think it is about 20 billion years though.
>Wrong! By most estimates, the UNIVERSE isn't even 20 billion years >old. The earth is about 4.5 billion years old, and the earliest life >forms appeared about 500 million years ago.
Wrong. The earth may be about 4.5 billion years old but there is evidence of life from 3.0 billion years ago. By 500 million years ago we had already had the Cambrian explosion and virtually all extant phyla were present.