- study of the interactions that take place among organisms and their environment 2. - living things within an ecosystem 3. - one of any living thing 4. - place where an organism lives and that provides the types of food, shelter, moisture, and temperature needed for survival 5. - chain showing how energy passes from one organism to the next 6. - eat producers 7. - any close relationship between species, including mutualism, commensalism, and parasitism. 8. - animal that hunts and kills other animals for food. It is a consumer [carnivore or omnivore] 9. - largest number of individuals of a particular species that an ecosystem can support over time 10. - non-living parts of ecosystem-air/water/soil/sun 11. - all the living organisms that live in an area and the nonliving features of their environment 12. - large geographic areas with similar climates and ecosystems. Includes: Tundra, Desert, Tropical Rainforest, Temperate Rainforest, Grassland, Arctic Tundra, Temperate Deciduous Forest 13. - in an ecosystem, refers to the unique ways an organism survives, obtains food and shelter, and avoids danger 14. - anything that can limit the size of a population, including living and nonliving features of an ecosystem, such as predators or drought 15. - show the direction in which energy flows. As the amount of available energy decreases, the pyramid gets smaller. Each layer on a pyramid is called a level. 16. through an ecosystem – The transfer of energy from one organism to another through food webs. 17. - organism that makes its own food, autotroph. 18. - organism that cannot make own food, a heterotroph 19. - consume wastes and dead organisms 20.