The answer is B. They have become habituated to human contact.
Eating to much sugar could give increase heart attacks and affects blood sugar so yes it is true if you are asking that sugar affects cardiovascular health
Answer:
The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.
