Science Revision

4. Something that blocks or stops things from passing through.
7. The organs that help you breathe in oxygen and breathe out carbon dioxide.
8. The beat you can feel in your wrist or neck as your heart pumps blood.
11. A material that does not let heat or electricity pass through easily.
12. dioxide A gas that we breathe out and plants use to make their food.
15. The substance that dissolves in a liquid.
16. Very tiny pieces that everything in the world is made of.
17. To make a good guess about what might happen next.
20. Keeping clean to stay healthy and stop germs from spreading.
22. A muscle under your lungs that moves to help you breathe.
24. A living thing that survives by taking nutrients from another animal or plant.
25. When a sperm and an egg join to start the beginning of a baby.
26. An animal that carries and spreads diseases from one place to another.

1. When a girl or woman’s body releases blood each month as part of the reproductive cycle.
2. Watching something carefully to learn or notice what is happening.
3. The new substances made after a chemical reaction happens.
5. The substances you start with before a chemical reaction happens.
6. A blood vessel that carries blood back to the heart.
9. The time when a child’s body starts to change into an adult’s body.
10. vessels Tiny tubes inside the body that carry blood everywhere.
13. A blood vessel that carries blood away from the heart.
14. The liquid that something dissolves into.
18. The tube that carries air from your mouth and nose to your lungs.
19. A material that allows heat or electricity to pass through easily.
21. Chemical messengers in the body that tell organs what to do.
23. A substance that keeps insects or animals away.