In my 6th grade science book it is said that there are no three legged animals, and that no animal with an odd number of limbs exists. I checked Wikipedia and could confirm this:
There are no known naturally occurring three-legged animals
On yahoo it is said that
When an embryo is developing, it grows by cell division - the first single cell divides into two, then four, then eight etc. It doesnt' divide into odd numbers - each cell divides in half. So, this means that every creature develops the same on each side of it's body - same number of limbs per side.
It seems to be a valid explanation. So is it true that any organ in any living organism is either one in amount or is in even number? And the explanation of yahoo.com is fine?
I am a beginner in Biology. Please explain in simple terms.
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