1. 1.2 Interdependence
Each and every species depends on many other species within an environment in order to survive and prosper.
Food chains and Food webs represent different types of ongoing relationships between and among all the organisms, within a particular environment.

2. Symbiosis
Another type of symbiosis (sym: together and bios: life) which is an association between members of different species.
There are four different types of symbiotic relationships we will investigate in grade 9.

3. Commensalism
A type of association in which one of the participating members benefits, but the other does not, and there is no harm done to that organism.

4. Woodpecker living in a tree

5. Barnacles on a whale

6. Mutualism
An association where both organisms benefit from the relationship.

7. Flower Clusia provides medicine to bees

8. Parasitism
An association where one organism benefits while the other organism (the victim) is harmed. The parasite usually doesn't kill the host, because the host represents the parasite's food supply.

9. Tapeworm in a human host

10. Interspecies competition
An association that happens when two or more species need the same resource. This type of relationship helps to limit the size of populations, of the competing species.
Resource Partitioning
When similar species share a resource in one area. Each will only eat from a specific location.

11. Predator/Prey Relationship
As the population of the prey increases so to will the predator population.
As the prey population increases they will begin to eat more prey, therefore the prey population will decrease and so to will the predator population.

12. Niches
A niche is the role of an organism within a particular ecosystem.
An organism's niche includes:
What it eats
What eats it
Its habitat
Nesting site, range and habits
What effect it has on the other populations
What effect it has on the environment