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Across 3. A proposed explanation based on observation...testable in an experiment. 7. A cell without a nucleus. 10. A level of classification that groups organisms based on similarities. 12. The process by which traits in a population become more or less common. 13. An organism in the past that more than one organism evolved from. 15. The broadest level of taxonomic classification. 16. The first part of a scientific name. 17. Gradual change over time through natural selection that leads to new species from a common ancestral species. 18. The second part of a scientific name, the most specific taxonin. 19. A diagram to show evolutionary relationships among organisms.

Down 1. Two-name, naming system; scientific name. 2. A cell with a nucleus and membrane bond organelles. 4. A statement based directly on one of the 5 senses. 5. A one-celled organism. 6. A logical conclusion based on evidence and reasoning. 8. Variation in a population or ecosystem. 9. A favorable trait in a population which increases fitness. 11. Organisms that contain more than one cell. 14. The second level of taxonomic classification...animalia and fungi are examples.