B. they are single molecules...
Predator is an animal hunt.The prey is the animal that is being eaten by other animals. if there a lots of predators and few preys.the predators will compete for food
Red Blood Cells transport oxygen through the body. Some things that can affect blood flow are constriction of blood vessels, drugs, caffine, and some heart diseases. Interactions between Red Blood Cells and other important molecules, cells, and organs.