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Across 5. Organism's reaction to a stimulus. 7. A process in which the procedures used during an experiment may be repeated an the results are evaluated by scientists who are in the same field or are conducting similar research. 8. Regulation of an organism's internal environment to maintain conditions needed for life. 10. A series of problem-solving procedures that might include observations, forming a hypothesis, experimenting, gathering and analyzing data, and drawing conclusions. 13. Orderly structure shown by living things. 16. A body of knowledge based on the study of nature. 17. Testable explanation of a situation. 18. Group of organisms that can interbreed and produce fertile offspring. 21. Changes an organism undergoes in its lifetime before reaching its adult form. 22. Explanation of a natural phenomenon based on many observations and investigations over time.

Down 1. Production of offspring. 2. Orderly, direct information gathering about a natural phenomenon. 3. Assumptions based on prior experience. 4. Process that results in mass being added to an organism; may include formation of new cells and new structures. 6. Any change in an organism's internal or external environment that causes the organism to react. 9. Inherited characteristic of a species that develops over time in response to an environmental factor, enabling the species to survive 11. Measurement system whose divisions are powers of ten. 12. Anything that has or once had all the characteristics of life. 14. Procedure performed in a controlled setting to test a hypothesis and collect precise data. 15. A factor that remains fixed during an experiment while the independent and dependent variables change. 19. Science of life; examines how living things interact, how systems function, and how they function at molecular level. 20. A set of values.