Across
- 3. Mass/Volume
- 8. In an experiment, the group that is not exposed to the treatment; comparison group
- 11. A group of individuals that belong to the same species and live in the same area
- 12. Two or more organisms fighting for a common resource
- 14. A cell characterized by the presence of a nucleus and other membrane-bound organelles. Eukaryotes can be unicellular (protists) or multicellular (fungi, plants and animals).
- 17. Biom in which the winters are cold but summers are mild enough to allow the ground to thaw; has coniferous trees, moose, bears
- 18. The theory by Darwin that the organisms that survive are the organisms that are best adapted to their environment
- 20. Sedimentary chemical and organic rock formed from the remains of marine organisms
- 23. An animal with a backbone
- 24. Living factors in an environment
- 26. The source of all energy in an ecosystem
- 27. All the different populations that live together in an area
- 28. Sedimentary rock formed from particles of clay; can contain fossils
Down
- 1. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
- 2. A trait that helps an organism survive and reproduce
- 4. An organism that can make its own food.
- 5. Comes from burning fossil fuels; can cause acid rain
- 6. An organism whose cells do not have an enclosed nucleus, such as bacteria.
- 7. Planting young trees or seeds on lands where trees have been cut or destroyed
- 9. Causes weather in the atmosphere, plate tectonics in the mantle, and currents in the ocean
- 10. A biological community of interacting organisms and their physical environment.
- 13. Warm, tropical biome with monkeys and large cats; receives over 80 inches of rain a year
- 15. Frozen precipitation that forms in layers in a cumulonimbus cloud
- 16. A chemical used to kill insects
- 19. Solid nonrenewable fossil fuel
- 21. A group of similar organisms that can breed and produce fertile offspring.
- 22. The shaking that results from the movement of rock beneath Earth's surface.
- 25. Non-living factors in an environment