Organism Relationships in an Ecosystem:
3 Types

Relationship between organisms comes in 3 major varieties: predation, competition, and symbiosis.  These organism relationships can happen between the same species OR different species.

Predation, competition, and symbiosis

20160601b relationship between organisms
(click to enlarge)

In predation, one organism eats another.  For example, a deer eats grass. Another example would be a wolf eating the deer.  In competition, one organism competes with another organism for resources.  

In competition, one organism competes with another organism for the same resources.  For example, a squirrel competing with a bird for the same tree counts as competition.  Or, a squirrel competing with another fellow squirrel also counts as competition.  

In symbiosis, one organism lives with another organism closely together.  This can be a friendly or not-so-friendly relationship.  

Next Generation Science Standards:

MS-LS2-1  Analyze and interpret data to provide evidence for the effects of resource availability on organisms and populations of organisms in an ecosystem.

MS-LS2-3  Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.

What Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Immunology

⇒Topic: Relationship between Organisms

Additional Information


Anything that helps an organism survive counts as a resource.  Examples of resources are: food, water, living spaces, mating partners…etc.

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