Across
- 1. the natural force of attraction exerted by the earth
- 3. a nucleic acid which contains genetic information about the human body
- 7. the process of removing water
- 9. the act of stretching
- 10. a statement showing the equality of two mathematical expressions, or a representation of a chemical reaction
- 12. the science of the relationships between organisms and their environments
Down
- 1. the branch of biology that studies heredity and variation in plants and animals
- 2. something that has a pH below 7.0
- 4. something that has a pH above 7.0
- 5. a poisonous gas found high in the earth’s atmosphere. This layer protects the earth from the sun’s radiation
- 6. the symbol relating to hydrogen ion (H+) concentration. Below 7.0 is acidic and above 7.0 is alkaline
- 8. the rubbing of one object or surface against another
- 11. a cell or organism that is a genetically identical copy