The predicted outcome is death
It's not that common actually quite rare because gray eyes are less than 1 percent of the earth population. Being that blue eyes and black hair is considered genetically impossible gray eyes are lighter, which makes it even more most likely impossible.
Fun fact: 10,000 years ago blue eyes didn't exist they are a mutation and everyone with blue eyes is technically related.
People can get chemical energy from food (carbohydrates)
