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Across 1. Rely on other organisms for their food. 4. Rely on producers or heterotrophs for their food. 6. Nonliving, physical things of interaction. 10. change over time 11. Feed on the remains of other organisms. 13. Organism that uses light to make food through photosynthesis. 14. Organisms that use the energy in sunlight or chemicals to make their own food. 18. Process in which humans breed organisms with desired variations of specific traits. 23. Organism that relies on the energy stored in chemical compounds to make their food. 24. Nature that selects those variations found useful for organisms in an environment. 28. Break down organic matter. 30. The role of the organism in the ecosystem. 32. A group of similar organisms that breed and produce fertile offspring 33. An area where an organism lives. 34. A group of ecosystems with the same climate. 35. Organisms that make their own food.

Down 2. Develop from the same embryonic tissues that provide evidence of modifications from common ancestors. 3. Get energy from eating only plants. 5. The scientific study of the interactions of organisms and their environment. 7. A collection of different populations 8. Inherited traits that increase an organism's chance of survival. 9. Greatly reduced structures that no longer serve any role. 12. The dependence of biotic and abiotic factors in an environement. 15. A group of individuals of the same species that live in the same area 16. Comparing fossils from older and younger rock layers. 17. Each step in a food chain or food web. 19. Diagrams that show the relative amounts of energy or matter at each trophic leve. 20. A well-suported, testable explanation of events that occur in the natural world. 21. Get energy from eating both plants and animals. 22. Get energy from eating only animals. 25. Shows how living things transfer energy by eating or being eaten. 26. The part of the planet where all life exists 27. All the organisms in a specific place together with their biotic and abiotic factors. 29. Links together all the food chains in an ecosystem. 31. Living things of interaction.