1. Today’s Agenda… Bellringer: Review Worksheet
Notes on Relationships Between Organisms
Symbiosis Skits

2. Relationships Between Organisms
Study Pack #10
Relationships
Between
Organisms

3. Today’s Goals…
I can examine different types of relationships that occur among populations in a community.

4. Symbiosis Any close relationship between two or more different species
Mutualism
Commensalism
Parasitism

5. Mutualism Both organisms benefit from the relationship
Examples: Figure 15, page 542

6. Commensalism One organism benefits and the other is not affected
Example: Flatworms in the gills of a horseshoe crab

7. Parasitism One species benefits and the other is harmed
Example: a tick on a dog

8. Predation
The act of one organism hunting, killing, and feeding on another
Controls population
Availability of prey can be a limiting factor
Predators can also be a limiting factor

9. Assignment
Symbiosis Skit