In the lab, Nachman examined dark mice from two different populations living hundreds of miles apart. The mice looked nearly identical. Their dark color was caused by two different genes. What does this tell you?
a. dark color evolved only once in rock pocket mice
b. under very similar conditions, natural selection can favor very similar adaptations
c. there are at least two genes involved in creating dark mouse fur
d. two completely different mutations in two separate genes can generate the same phenotype
e. dark fur color evolved independently on each lava flow