Across
- 1. results in the addition of mass to an organism
- 5. must be the same _____ to produce offspring
- 6. process of natural changes
- 7. the science of life
- 9. something that causes a reaction by the organism
- 10. what living things display
- 11. results from changes
Down
- 2. production of offspring
- 3. the reaction to a stimulus
- 4. necessary for an organisms internal conditions to work
- 8. has or had living characteristics