1. Animals cells can not prepare their food because

2. The living things which eat Grass are called

3. Which of them is best solvent

4. What are tissues

5. The living things which eat meat are called

6. A solution consisting of two substance is called

7. Which organisms are called producers

8. Which of them is the most important machine

9. A machine makes the work

10. The power house of cell is called

11. which statement is true

12. Which gas is used in photosynthesis

13. The main components of environment are called

14. What is the speed of sound in air

15. What is called universal solvent

16. The percentage of nitrogen in the air is

17. Which of them is energy of the sun

18. Sound can not travel in vacuum because

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

20. Planet and their moons are the examples of