1.Which part of the skeleton protects the heart and lungs?

2.Through which part do most plants take in water?

3.What carries messages between the brain and the rest of the body?

4.Which part of the blood fights infections?

5.Which organ makes bile and breaks down harmful substances such as alcohol?

6.In which organ are most digested nutrients absorbed into the blood?

7.Which nutrient does the body mainly need for growth and repair?

8.How many chambers does the human heart have?

9.Which part of the blood carries oxygen?

10.What is the main job of plasma?

11.Which gas is there more of in the air we breathe out than in the air we breathe in?

12.What is the largest organ of the human body?

13.How many bones are in an adult human skeleton?

14.What is the main job of the heart?

15.Which organ takes oxygen into the blood and removes carbon dioxide?