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Across 4. possible explanation for a set of observations or possible answer to a scientific question 9. the combination of chemical reactions through which an organism builds up or breaks down materials 11. process of reproduction involving a single parent that results in offspring that are genetically identical to the parent 12. well tested explanation that unifies a broad range of observations and hypotheses that enables scientists to make accurate predictions about new situations 13. deoxyribonucleic acid; the genetic material that carries information about an organism and is passed from parent to offspring 16. variable that is observed and that changes in response to the independent variable also called the responding variable 18. particular preferences or point of view that is personal rather than scientific 19. evidence information gathered from observation

Down 1. organized way of gathering and studying evidence about the natural world 2. signal to which an organism responds 3. experiment in which only one variable is changed 5. relatively constant internal physical and chemical conditions that organisms maintain 6. factor in a controlled experiment that is deliberately changed or manipulated 7. type of reproduction in which cells from two parents unites to form the first cell of a new organism 8. process of noticing and describing events processes in a careful and orderly way 10. group in an experiment that us exposed to the same conditions in the experimental group except for one independent variable 14. part of the Earth in which life exists including land, water, and air or atmosphere 15. a logical interpretation based on prior knowledge and experience 17. scientific study of life