Answer: B) an increase in gene flow between the bird populations.
Explanation:
The formation of tiny island will connect the island and the mainland. The distance between the two habitats will reduce due to the tiny island which can also become another habitat for birds. Thus the gene flow will increase between the birds of two different habitats as the population of two habitats can mate and produce progeny.
The red nucleus and substantia nigra are located in the tegmenjtum and are involved in the motor system.
