mitochondria
yes some even have two diffrent colored eyes
They were born with it
yes
Smiths disease, a rare genetic disease that stirkes children at an early age and causes heart conditions and an elf-like appearance.
The god with two different colored eyes is named Heterochromia. He is usually associated with dualities and is believed to have the ability to see both the physical world and the spiritual world.
It is just a genetic trait of their species. Not all orange cats have orange eyes, but it is the most common. Cats can have eyecolours as wide in variety as humans.
Waardenburg synrome is an autosomal genetic disorder characterized by deafness, confluent brows, early grey hair as young as 12, different colored eyes or unusually brilliant blue eyes. Source US NIH Deafness and other communcation disorders. Its named Waardenburg because it was discovered Prietrus Waardenburg who noticed girls and boys with unmatching eyes tend to deafness. There are four main types.
No, the Historical American Girl Dolls do not come with different colored eyes. However, the Just Like You ® Dolls have all different colors of skin, hair, and eyes. Instead of Samantha with different eyes, you could buy a Just Like You ® Doll with light skin, dark brown hair, and--for example--green or blue eyes. She would not be the same doll, but would look very similar and have different colored eyes. I hope this answers your question.
Justin Bieber's eyes are brown/hazel. They do not change color, because the eye is not capable of doing that. However if you saw a picture of him with different colored eyes, it may be because he was wearing colored contacts.
Her natural eye color is brown but she wears colored contacts to make them different colors
many albino animals have different colored eyes.animals with blue eyes often have poor eyesight or are blind.
to tell what character and personality is which.