Radiation

4. a period of about 20 or 30 years - the average time from birth until a person has children
9. to discvoer, usually something that was hidden or hard to notice
11. the total amounts of electrical energy in things
12. to clean very well and make free of germs
14. photographs made using invisible rays hat can travel though some solid substances
16. what other people think and feel about someone or something
22. the pieces of our DNA that carry instructinos for making different body parts
23. very tiny pieces of matter that are smaller than atoms
24. energy that is sent out in rays or waves by certain substances
25. the growth or formation of something

1. surrounding area
2. good, positive, or helpful things
3. to become different from other things of the same type
5. living things
6. involving energy from the nucleus, or center, of atoms
7. treatment of diseases, illnesses, or problems
8. traits or special features that make a person or thing different
10. extremely important or necessary
13. left uncovered, open to danger, or unprotected against the effects of something
15. brings about
17. left-over or extra
18. a possibility or an ability to do something
19. causing death
20. adjusting, varying, or changing
21. amounts someone is exposed to, or amounts that someone takes at one time