Question

[brianpugh]

Hi,

I was just wondering why we have 2 of some body parts and only one of others. Why do we have 2 kidneys when we can get on perfectly well with just one? And why don't we have 2 hearts when it's so common for the one we have got to go wrong? Could this change in the future as we evolve, or has it already changed?



Please help.

Thanks!



I didn't find the right solution from the Internet.



References:

www.thenakedscientists.com/articles/questions/why-have-one-heart-two-kidneys

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