What a great question! In a sense all organisms have been alive since life began in the primordial soup. Although as individuals each of us is conceived when a sperm fuses to an egg to form a single cell called a zygote, the sperm and egg were themselves alive and came from cells in a parent organism that was similarly conceived. So organisms do not really begin life at conception--that is just the creation of a new genetic identity from something that was already alive. Everything alive today is a continuation of a living process (cell division) that began on earth over 3 billion years ago. We are all related, descended from the same ancestral cell that emerged from the primordial soup way back when.
by Canucks goal2 years ago
How did life begin?on the planet earth
by Amanda S18 months ago
Could you donate an organ while you are still alive?Humans can live with one kidney, and can survive even after donating part of their liver or lung. This is a bit different than being an organ donar, where they take...
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