What benefit do we get from a second kidney

We have two kidneys in order to balance the load placed upon them by the body.  With one kidney only half the amount would be processed. The body can manage with only one kidney but the job is faster and easier with two doing the work. The sooner toxins and waste are removed from the body the better!

There is also the issue of body balance and symmetry. It is also good to have two kidneys in case one should become damaged or destroyed. Without kidneys or a dialysis machine cleansing the blood the body dies, overwhelmed by toxins.