How have the historic levels of melanin in human populations changed due to migration? (1 point)
• Humans that produced more melanin became more common as populations migrated toward the equator.
• Humans that produced more melanin became more common as populations migrated away from the equator.
• Humans that produced less melanin became more common as populations migrated away from the equator.
• Humans that produced less melanin became more common as populations migrated toward the equator.