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Across 4. the study of interactions between organisms and their environment 8. the total area of land and water needed to provide resources and absorb wastes for an individual or population 9. consists of all life on Earth and all parts of the Earth where life exists 10. a group of organisms that can interbreed and produce fertile offspring 11. a group of ecosystems that have similar climates and typical organisms 12. different populations that live together in a defined area

Down 1. the natural changes that occur in an ecosystem over time 2. a group of individuals that belong to the same species and live in the same area 3. the colonization of barren land by communities of organisms 5. the total area of land and water needed to provide resources and absorb wastes for an individual or population 6. the series of changes that occur after existing community is disrupted 7. the total of all the genetically based variation in all organisms in the biosphere 8. all the organisms living together in a place, along with the nonliving components of their environment