Across
- 4. solids that formed from remains of plants that lived millions of years ago.
- 5. liquid that formed from the remains of sea plants and animals that lived millions of years ago.
- 6. signs of disease
- 7. a medicine that kills bacteria.
- 10. the body’s natural defense against disease.
Down
- 1. a bacteria that can be on uncooked chicken and cause food poisoning.
- 2. an advantage of something.
- 3. one of the most widely used forms of energy in daily life.
- 8. one-celled microorganisms that cause many diseases
- 9. a type of light bulb that help to save energy compared to traditional incandescent light bulbs.