Across
- 3. groups of organisms change over time.
- 4. editing and rewriting the genetic code.
- 8. cells from two parents unite to form the first cell of a new organism.
- 10. an increase in size.
- 13. producing new similar organisms.
- 15. variables that are not changed.
- 17. a signal to which an organism responds.
- 18. organisms that are single-celled.
- 20. the variable that is deliberately changed.
- 21. are descriptive.
- 22. life on Earth is affected by the atmosphere and climate.
- 25. living things maintain a relatively stable internal environment.
- 26. factors that can change.
- 27. written in a molecule called DNA.
Down
- 1. the relationships between hosts and pathogens are dynamic and constantly changing.
- 2. organisms that have many cells.
- 5. a scientific explanation for a set of observations that can be tested.
- 6. are numbers obtained by counting or measuring. of plants per plot, plant sizes, and growth rates.
- 7. a decimal system of measurement that are scaled on multiples of 10.
- 9. a diagram that shows how different species are related to each other.
- 11. exposed to the same conditions as the experimental group except for one independent variable.
- 12. a single organism produces offspring identical to itself.
- 14. cells begin to look different from one another and to perform different functions.
- 16. the variable that is observed.
- 19. studies of DNA and other molecules inside cells.
- 23. the act of noticing and describing events or processes in a careful, orderly way.
- 24. the smallest units considered fully alive.