I.Multiple Choice:Write the letter of the correct answer on the space provide. 1.The heart pumps blood that carries oxygen and nutrients to the differrent parts of the body.To which organ system does the heart belong? A.circulatory B.digestive C.excretory D.reproductive 2.Each part of an organ system plays a specific function .Which of the following structures does not much its function A.Eyes:sight B.Heart:circulation C.Kidneys:respiration D.stomach:digestion 3.Which is the correct sequence -from biggest to smallest -of the levels of organization in an organism? A.Cell>organ>organ system >tissue B.Organ > organ system> tissue>cell C.tissue>cell>organ>organ system D.organ system >organ >tissue>cell 4.Which of the following is an organ of the circulatory system? A.Heart B.Kidney C.roots D.stems 5.Plants also have organ systems.Which plant organ DOES NOT belong to the shoot system? A.Flower B.leaf C.root D.stem 6.A muscular organ about the size of your fist that pumps and circulates blood to the different parts of the body. A.Heart B.Kidney C.Lungs D.stomach 7.How do plants benefits from their root system? A.They obtain water and nutrients from the soil B.They provide strength and support C.They manufacture food D.They produce flowers​