1. The living things which eat both plants and meat are called

2. Sound can not travel in vacuum because

3. What is the speed of sound in air

4. The power house of cell is called

5. Planet and their moons are the examples of

6. Animals cells can not prepare their food because

7. The living things which eat meat are called

8. A machine makes the work

9. The percentage of nitrogen in the air is

10. The living things which eat Grass are called

11. Which gas is used in photosynthesis

12. The main components of environment are called

13. A solution consisting of two substance is called

14. What is called universal solvent

15. which statement is true

16. What are tissues

17. Which of them is the most important machine

18. Which of them is best solvent

19. Which of them is energy of the sun

20. Which organisms are called producers