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Across 4. Anything that has or once had all characteristics of life 7. A body of knowledge based on the study of the natural world 9. An organism that collects energy from sunlight or inorganic substances to produce food 10. Any inherited characteristic that results from changes to a species over time 12. The process of natural change that takes place during the life of an organism 13. The portion of the Earth that supports life 15. The production of offspring 16. Information gained from observations 17. The role or position a that an organism has in its environment. 19. A large group of ecosystems that share the same climate and have similar types of communities 20. A system of collecting data and performing experiments using powers of ten (2 Words) 21. A set of moral principles or values 22. Anything that takes up space and has mass 23. The close relationship that exists when two or more species live together 24. The exchange of matter through the biosphere (2 Words)

Down 1. A direct method of gathering information in an orderly way 2. A group of organisms that can breed with one another and produce fertile offspring 3. An explanation of a natural phenomenon supported by many observations over time 5. A factor that remains fixed during an experiment 6. A heterotroph that eats only plants 8. Organisms that eat both plants and animals 11. An investigation of a phenomenon in a controlled setting to test a hypothesis 12. A process in which fixed nitrogen compounds are converted back into nitrogen gas and returned to the atmosphere 14. A relationship in which one organism benefits and the other organism is neither helped nor harmed 18. Of or relating to the study of life or living organisms