How have the historic levels of melanin in human population change due to migration
A. humans that produce less melanin became more common as population migrated away from the equator.
B. Humans that produce less melanin became more common as populations migrated toward the equator.
C. Humans that produced more melanin became more common as populations migrated toward the equator.
D. humans that produced more melanin became more common as population migrated away from the equator.