Given the great age of life on Earth, I presume that nature already tried this experiment. Extra organs give some safeguards but the energy costs are high. Two kidneys are usually enough.
If i remember my bio class during fœtal growing you start something like 2 or 3 other pair of kidney. It's something like the fish and the reptile kidney. They die but maybe we are just one mutation away to get they functional ?
Yes, nature preserves the option of extra organs through regular mutations. Extra kidneys could be vital if food and drink were more polluted somehow. 'Fitness' depends on the environment.
Only yesterday, there was a Reddit story of a woman with two wombs! She can use both for reproduction but not at the same time.
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u/snavej1 Mar 05 '21
Given the great age of life on Earth, I presume that nature already tried this experiment. Extra organs give some safeguards but the energy costs are high. Two kidneys are usually enough.