1. Interactions among Organisms
Ecology Unit

2. Community Interactions
Community interactions, such as competition, predation, and various forms of symbiosis, can powerfully affect an ecosystem.

3. Competition
Occurs when organisms of the same or different species attempt to use resources in the same place at the same time.

4. Predation
An interaction in which one organism captures and feeds on another organism.

5. Symbiosis Any relationship in which two species live closely together.
Mutualism
Both species benefit from the relationship.
Commensalism
One member benefits and the other is neither helped or harmed.
Parasitism
One organism lives on or inside another organism and harms it.

6. Mutualism

7. Commensalism

8. Parasitism