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Across 5. A system formed by the interaction of a community of organisms with their environment. 7. A term that describes the number of different species that live within a particular ecosystem. 10. All the members of one species in a habitat at one time. 11. The percentage of light that is reflected from a surface. 12. The death rate.

Down 1. All the organisms in a particular habitat at one time. 2. Chemicals used to kill pests. 3. The study of living things, their environment, and the relation between the two. 4. An organism that is unable to make its own food and is dependent upon organic substances. 6. An organism that feeds on other organisms. 8. An organism capable of synthesizing its own food from inorganic substances, using light or chemical energy. 9. The birth rate. 10. An organism that is able to produce its own food.