Across
- 1. Process by which organisms with traits better suited to their environment tend to survive and reproduce.
- 6. Relationship in which both species benefit.
- 7. Organism that breaks down dead organisms and recycles nutrients.
- 8. Tropical grassland biome with scattered trees and seasonal rainfall.
- 9. Cold, treeless biome with permafrost and low-growing vegetation.
- 10. Long-term patterns of temperature and precipitation in an area.
- 11. Formation of new and distinct species in the course of evolution.
- 12. Species introduced to a new habitat that outcompetes native species.
- 16. Division of a population’s gene pool that reduces or eliminates gene flow between groups.
- 20. Organism that gets its energy by eating other organisms.
- 21. Form of reproductive isolation in which two populations develop differences in courtship rituals or behaviors.
- 22. Animal that feeds on the remains of dead organisms.
- 24. Relationship where one organism benefits while the other is harmed.
- 27. All of Earth’s water in liquid form, including oceans, lakes, and rivers.
- 28. All living organisms on Earth and the environments in which they live.
- 29. Species that has a disproportionate effect on the stability of its ecosystem.
- 30. Biome dominated by trees that shed their leaves seasonally.
- 31. Biome with high rainfall, dense vegetation, and high biodiversity.
- 33. Separation of populations by physical barriers such as mountains, rivers, or distance.
- 35. Organism that makes its own food, usually through photosynthesis.
- 36. Species likely to become endangered in the near future.
- 37. Biome dominated by grasses with few trees, found in regions with moderate rainfall.
Down
- 2. Biome dominated by coniferous forests, also called boreal forest.
- 3. Earth’s rigid outer layer, including the crust and upper mantle.
- 4. Reproductive isolation that occurs when species reproduce at different times.
- 5. Biome with very low precipitation and organisms adapted to dry conditions.
- 13. When individuals of different species compete for the same limited resource.
- 14. Group of organisms that can interbreed and produce fertile offspring.
- 15. Reproductive isolation caused by differences in reproductive structures that prevent mating.
- 17. Species at risk of extinction throughout all or a large portion of its range.
- 18. All of Earth’s frozen water, including glaciers, ice caps, and sea ice.
- 19. Relationship in which one organism hunts, kills, and eats another.
- 23. Relationship where one species benefits while the other is neither helped nor harmed.
- 25. High mountain biome with cold temperatures and limited vegetation.
- 26. Day-to-day atmospheric conditions such as temperature and precipitation.
- 32. Biome with hot, dry summers and mild, wet winters; dominated by shrubs.
- 34. Species whose presence, absence, or abundance reflects environmental conditions.