Science one-word quiz

Write a one-word answer for each question.

1. The natural satellite of the Earth

2. The bouncing back of light from a surface

3. The force that pulls objects towards the Earth

4. The powerhouse of the cell

5. Animals without a backbone are called

6. The transfer of pollen from anther to stigma

7. The instrument used to measure temperature

8. Animals with a backbone are called

9. The pigment in red blood cells that carries oxygen

10. The organ that pumps blood around the body

11. The organ we use for hearing

12. The planet famous for its bright rings

13. Animals that eat only other animals are called

14. The organ we use for seeing

15. A reddish-brown metal used in electric wires

16. The part of a plant that absorbs water from the soil

17. The instrument used to see very tiny things

18. The planet closest to the Sun

19. The SI unit of force

20. The largest organ of the human body

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