1. The living things which eat Grass are called

2. Sound can not travel in vacuum because

3. What are tissues

4. A machine makes the work

5. Which of them is best solvent

6. Which of them is the most important machine

7. Planet and their moons are the examples of

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

9. Which gas is used in photosynthesis

10. The percentage of nitrogen in the air is

11. What is called universal solvent

12. A solution consisting of two substance is called

13. which statement is true

14. Which of them is energy of the sun

15. The main components of environment are called

16. Animals cells can not prepare their food because

17. The power house of cell is called

18. What is the speed of sound in air

19. Which organisms are called producers

20. The living things which eat meat are called