Across
- 3. Factors that cause population growth to decrease
- 7. Preserved remains of, or traces of, ancient organism
- 9. An organism that breaks down dead organic material
- 10. Any beneficial alteration in an organism resulting from natural selection
- 13. An animal that feeds on only plants
- 14. The branch of biology and medicine concerned with the study of embryos and their development
- 16. Structures that share a common function, but not an evolutionary history
- 18. Tactic that organisms use to disguise their appearance
- 19. Seasonal movement of animals from one region to another
- 20. Change over time
- 25. "Survival of the fittest"
- 27. A resemblance of one living thing to another or to natural objects among which it lives that gives it an advantage
- 28. A symbiotic relationship in which one organism benefits and the other is neither helped nor harmed
- 29. A symbiotic relationship in which both species benefit from the relationship
- 30. A group of ecosystems that share similar climates and typical organisms
Down
- 1. A relationship in which two species live close together
- 2. Groups of individuals of the same species that live in the same area
- 4. An assemblage of different populations that live together in a defined area
- 5. Refers to the rivalry between or among living things
- 6. An organism that mostly consumes decaying biomass
- 8. The selection of mates based on heritable traits
- 11. Having descended from one ancestor
- 12. The study of the past and present distribution of organisms
- 15. A group of similar organisms that can breed and produce fertile offspring
- 17. The movement of genes into or out of a population
- 21. An animal that feeds on flesh
- 22. How well an organism can survive and reproduce in its environment
- 23. Structure that is inherited from ancestors but which has lost much or all of its original function
- 24. The part of Earth in which life exists, including land, and air or atmosphere
- 26. A relationship in which one organism lives inside or on another organism and harms it
