What does the circulatory system do for the stomach

The digestive system breaks food down into nutrients such as glucose. Now the circulatory system enters the picture. It transports glucose and other nutrients from the digestive system to the cells. The circulatory system also transports oxygen from the lungs to the cells.

i think it is true in my reasonment ..

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.