Across
- 5. the struggle between organisms to obtain the same limited resource
- 9. inherited biological or behavioral trait that increases a population’s chances of survival in a specific environment
- 13. degree of species variety and balance in an ecological community
- 14. changes in populations over long periods of times
- 15. thin layer of air, land, and water that is home to all living things on Earth
- 17. a collection of interacting populations within a given ecosystem; its organisms depend on each other for survival
- 18. science and study of life
Down
- 1. factor a nonliving part of an environment (i.e. water, soil light, temperature, wind, etc.)
- 2. factor a living part of an environment (i.e. plant, animal, or other organism)
- 3. maintenance of a stable set of internal conditions within an organism
- 4. a group of organisms of the same species living in a specific area
- 6. two or more different types of tissues that work together to perform a specific function
- 7. large group of similar ecosystems containing distinctive types of plants and other organisms; determined by the climate
- 8. process by which living things give rise to offspring
- 10. the smallest unit of life capable of carrying out all of the functions of living things
- 11. study of organisms and their interactions with their environment
- 12. group of similar cells that work together to perform a specific function
- 16. any living thing
- 17. theory this states that cells are the basic unit of life, that all organisms are made of one or more cells, and that cells arise from existing cells