Biology Crossword! Name______________________ Class/Period_________ Biology Crossword! Name______________________ Class/Period_________ Across Down 3. Any living thing. 1. The surroundings where an organism exists. 4. A specific organism. 2. Nonliving things in an ecosystem. 6. All living things in an ecosystem. 8. A proven hypothesis. 12 . The study of living things. 5. 7. Changes that allow an organism to survive. variable that is not changed in an experiment. 9. Any community of living and nonliving things that work together. 10 . The balance created within an organism. 11 . Concept that is tested in an experiment. 13 . The part of the earth where life exists. 14 . The variety of life in the world or in a particular habitat or ecosystem.