Answer:
4. Habitat Isolation
Explanation:
Habitat isolation is a type of prezygotic reproductive barrier or isolation that occurs when two similar populations that can interbreed successfully are prevented from mating with each other as a result of being isolated by habitat. That is, they occupy different habitats. This is what keeps these frogs recognizably distinct.
I think the answer is B because when you think of wind as an energy source you think of wind turbines,, the big things that turn high in the sky. And since it’s in the sky, birds and other flying animals can fly into it and die. Furthermore it can’t be A since wind energy doesn’t use radioactive material, for C I do not believe it uses ground water, and for D the small greenhouse gas emissions it may make to convert the wind energy into electricity (it might not produce any, it depends on how far science has come in the past few years) would be nothing compared to the amount produced burning coal or using gasoline or something like that.
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.
C. an Anion is the correct answer