1. 1.2 Ecosystems

2. Organism Simplest level, a single living.
Surviving in as habitat (region where it lives)

3. Population
Second level, all organisms of the same species that share a habitat

4. Community
All the populations in a particular area that interact (food supply, predators, etc)

5. Ecosystem
The living community and the surround non-living (abiotic) environment

6. Biosphere Total area on Earth where living things are found Includes:
Soil (lithosphere)
Air (atmosphere)
Water (hydrosphere)

7. Ecological Hierarchy

8. Symbiosis
Symbiosis refers to any close relationship between two different species
Mutualism
Commensalism
Parasitism

9. Mutualism (+/+)
Mutualism is a relationship in which both species obtain some benefit from the interaction.

10. Commensalism (+/NA)
Commensalism is an interaction in which one organism benefits while the other is unaffected.

11. Parasitism (+/-)
Parasitism occurs when on organism (the parasite) benefits by living and feed on, or in, the body of another organism (the host).
Harms host, but usually slowly so the host is not killed!

12. Competition
Competition is a harmful interaction where two species compete for limited resources
Examples:
Food
Prey
Water
Mates
This can occur between members of the same species, or different species

13. Predation
Predation occures when one organism (the predator) eats all or part of another organism (the prey).
Usually think of mountain lions, tigers etc., but also includes insects and plants

14. Predation
There is a repeating cycle between populations of predator and prey