I believe the answer B,have two recessive traits.
Scientists used case studies to help them determine that the right side of the body was connected to the left of the brain and vice versa. A case study is a process or record of research into the development of a particular person, group or situation of a given period of time.
2. The function of wings is flight
Answer: D
Explanation:
A change in the amount of polar ice will alter how ocean currents move