B4.1

3. A biome characterized by coniferous forests and cold subarctic climates.
4. The inevitable loss of water vapor from a plant during gas exchange.
7. A plant specifically adapted to survive in very dry conditions like a desert.
10. A heritable trait that increases an organism's chance of survival.
12. A single living individual of a particular species.
13. A group of populations of different species living and interacting with each other in an area.
14. The range of abiotic factors within which an organism can function.
15. The waxy outer layer of a leaf that is thickened in xerophytes to prevent water loss.
16. A plant specifically adapted to survive in high salinity soil or water.
17. A cold, treeless biome with a layer of permanently frozen subsoil.
18. A biome with high rainfall and constant warm temperatures.
19. A group of organisms that can interbreed to produce fertile offspring.

1. The specific environment in which an organism normally lives.
2. The concentration of salt in the soil or water.
5. Non-living factors such as temperature and water that influence an ecosystem.
6. A group of organisms of the same species living in the same area at the same time.
8. When different species develop similar adaptations due to similar environmental pressures.
9. Pores on leaves that xerophytes often keep closed during the day to save water.
11. Large geographical areas with similar climatic conditions and ecosystems.
17. A line across a habitat used to investigate the distribution of organisms.