Answer:
In physical appearance can be changed by different DNA but for mental not very sure.But mental state can be altered when the DNA has anomaly or mutation. Mostly, people whom has high education always study hard for example students even they have physical problem but they still have good mental
Common microscopic chromosomes in fresh water
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
