Why do we have two kidneys

we have two kidneys is so that there is some extra reserve of kidney mass in case we sustain some renal insult .The kidney is made up of nephrons, whose job is to filter, secrete and reabsorb solutes and water. More kidney mass = more nephrons.

Explanation:

We Have two kidneys as we need some extra reserve of kidney mass in case we sustain some sort of injury.

A kidney is made up of nephrons ,which is its job to filter,reabsorbs solutes and water.

More kidney mass,more nephrons.

Your kidneys are important they help your bones create new blood cells and have many important functions.Some people are only born with one but you still can survive ,having two is just something like a replacement if the kidney fails(shuts downs) due to an injury.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

i wish i could with all of them i can barley see the first one so here's the answer to the first one b