Biology

4. An apparent link or relationship between two factors.
7. The hormone produced during 'fight or flight' moments.
9. Nerve cells carrying signals from the central nervous system to the effector organs.
12. The end product of anaerobic respiration in animals.
14. Used to destroy a tumour, but can also cause mutations and cancer in healthy organisms.
15. An abnormal growth of cells.
19. The regulation of the internal conditions of a cell or organism to maintain optimum conditions.
20. A rapid automatic response to stimuli
21. Breaking down glucose in an exothermic reaction, releasing energy for the cells.
22. An abnormal growth of cells, contained in one area and do not invade other tissues.
23. Respiration in the absence of Oxygen.
24. Carbohydrate store of glucose in animals.

1. The process by which plants make food from Carbon Dioxide and water.
2. The common name for a malignant tumour
3. A hormone involved in controlling blood sugar levels (decreasing sugar levels)
5. Substance that increases the risk of developing cancer.
6. A hormone controlling the menstrual cycle.
8. Nerve cells that detect stimuli.
10. Methods of preventing pregnancy
11. The release of an egg (ovum) from the ovary.
13. A hormone involved in controlling blood sugar levels (increasing sugar levels)
16. An abnormal growth of cells, invading neighbouring tissues and spreading to the blood and other parts of the body.
17. A hormone controlling the production of sperm.
18. changes in the external or internal environment.