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ANSWER IS BEING EDITED Although most people have two kidneys, some have only one kidney. We can live with only one kidney. Infact, there are some animals still only have one kidney such as single-kidney rats. Many people are born with only one and we don't need two kidneys. One healthy kidney can work as well as two.

A pair of Kidneys evolved in humans as bilateral symmetry in vertebrates by evolutionary modifications of the nephridia. During embryological development, the organs are that fall outside liver also has two lobes. ANSWER IS BEING EDITED

Although most people have two kidneys, some have only one kidney. We can live with only one kidney. Infact, there are some animals still only have one kidney such as single-kidney rats. Many people are born with only one and we don't need two kidneys. One healthy kidney can work as well as two.

A pair of Kidneys evolved in humans as bilateral symmetry in vertebrates by evolutionary modifications of the nephridia. During embryological development, the organs are that fall outside the bilateral symmetry are singular (which includes the digestive tract organs as mentioned by @John). But if you notice, liver also has two lobes.

Although most people have two kidneys, some have only one kidney. We can live with only one kidney. Infact, there are some animals still only have one kidney such as single-kidney rats. Many people are born with only one and we don't need two kidneys. One healthy kidney can work as well as two.

A pair of Kidneys evolved in humans as bilateral symmetry in vertebrates by evolutionary modifications of the nephridia. During embryological development, the organs are paired. The liver also has two lobes.

ANSWER IS BEING EDITED Although most people have two kidneys, some have only one kidney. We can live with only one kidney. Infact, there are some animals still only have one kidney such as single-kidney rats. Many people are born with only one and we don't need two kidneys. One healthy kidney can work as well as two.

A pair of Kidneys evolved in humans as bilateral symmetry in vertebrates by evolutionary modifications of the nephridia. During embryological development, the organs are that fall outside liver also has two lobes. ANSWER IS BEING EDITED

Although most people have two kidneys, some have only one kidney. We can live with only one kidney. Infact, there are some animals still only have one kidney such as single-kidney rats. Many people are born with only one and we don't need two kidneys. One healthy kidney can work as well as two.

A pair of Kidneys evolved in humans as bilateral symmetry in vertebrates by evolutionary modifications of the nephridia.

Although most people have two kidneys, some have only one kidney. We can live with only one kidney. Infact, there are some animals still only have one kidney such as single-kidney rats. Many people are born with only one and we don't need two kidneys. One healthy kidney can work as well as two.

A pair of Kidneys evolved in humans as bilateral symmetry in vertebrates by evolutionary modifications of the nephridia. During embryological development, the organs are paired. The liver also has two lobes.