Thursday, 9 February 2017

cell biology - Why are there no known animals with an odd number of legs?


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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