1. Two or more organisms living together in a close association
Symbiosis
Two or more organisms living together in a close association

2. Three kinds of symbiosis
Mutualism Commensalism Parasitism

3. Mutualism A symbiotic relationship in which both species benefit
Ex. The bee benefits by obtaining food (nectar) and
the plant benefits when the flowers are pollinated

4. + + Dog and Human Symbiotic relationship Mutualism Both benefit
Bee and Flower
Defining question: Where did you find these examples?

5. Commensalism
A symbiotic relationship in which one species benefits and the other species is not harmed or benefited. Ex. Barnacles on this Gray Whale are benefited but the whale is not harmed or benefited.
Talk to the students about how Barnacles benefit from being attached to the whale. The use them for motility and for easy access to food.

6. + o Symbiotic relationship Commensalism
Students must complete this circle map on their own. Add examples that represent commensalistic relationships.
One benefits and the other is neither benefited nor harmed
Defining question: Where did you find these examples?

7. Parasitism One member benefits and the other member is harmed
The organism that benefits is called the parasite
The organism that is harmed is called the host

8. + - Symbiotic relationship Parasitism
One is benefited and the other is harmed
Defining question: Where did you find these examples?

9. Predation
The act of killing one
organism for food.

10. Symbiotic relationship
Competition
Two or more species compete for
Defining question: Where did you find these examples?

12. Two species using the same resources
Competition
Two species using the same resources
Food
Shelter
living space
light
mineral nutrients
water
Usually occurs when there is a limit or shortage of the above supplies in the ecosystem.

13. Niche: Where an organism lives and what it does there.
The Effects of Competition on the Niche of an Organism
Niche: Where an organism lives and what it does there.