1. A solution consisting of two substance is called

2. A machine makes the work

3. What are tissues

4. The percentage of nitrogen in the air is

5. The living things which eat meat are called

6. The living things which eat Grass are called

7. The main components of environment are called

8. Which gas is used in photosynthesis

9. Which organisms are called producers

10. Which of them is best solvent

11. What is called universal solvent

12. Sound can not travel in vacuum because

13. Animals cells can not prepare their food because

14. Which of them is energy of the sun

15. The power house of cell is called

16. What is the speed of sound in air

17. Which of them is the most important machine

18. Planet and their moons are the examples of

19. which statement is true

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