Why do people have two of everything?

we have two boobs, two testicles, two ovaries, two arms, two eyes, two nostrils, two lips, two ears, two feet, two legs, two buttocks, and two nipples.

When life first formed, it split every atomic carbon particle into binary systems... one positive and the other negative. They cling to each other for support and to function life. Kind of like yin and yang