It took a long time to get from prokaryotes to eukaryotes, then a fir while to get to multicellular life. However, once you get to about 600 million years ago, an event called the Cambrian explosion occurred, and withing about 50 million years, the ancestors of all forms of modern animals were in existence ( at the Phylum level of course).
Read Stephen J Gould's book "Wonderful life" for the full story. He is a much better writer than I am.
If bacteria took million years to form amoeba then how many years took to form complete life on the earth?
Define complete?
I'd have to say 4.5 billion years.
Reply:It took one week to complete the earth.
Reply:45 million years
Reply:about like i think about a quadrillion
Reply:The exact time it took to get from the first living thing on earth to the present.
Reply:It took one week to complete the earth.
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