1. How many bones are in the adult human body?

2. Which blood type is known as the universal donor?

3. What is the largest mammal in the world?

4. What vitamin do humans mainly get from sunlight?

5. What is the powerhouse of the cell?

6. What part of the human body produces insulin?

7. How many teeth does a typical adult human have?

8. What is the largest internal organ in the human body?

9. Which gas makes up the majority of the Earth’s atmosphere?

10. What part of the human eye controls the amount of light entering?

11. What type of blood cells help fight infection?

12. What is the human body’s largest organ?

13. What gas do humans exhale when breathing?

14. What is the main function of red blood cells?

15. How many chambers are in the human heart?

16. What is the rarest blood type?

17. How many pairs of chromosomes do humans have?

18. What organ is primarily responsible for filtering blood?

19. What is the branch of science that deals with heredity?

20. Which animal is known as the “ship of the desert”?