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Relationship in which two species live closely together

Types of Symbiosis

Mutualism, Commensalism, Parasitism and Predation


Both benefit and are dependent on each other


One benefits and the other is neither helped nor harmed


One benefits and the other is killed


The organism that is the hunter


The organism that is being hunted


One benefits and the other is harmed


Orgnaism that grows, feeds and is shelterd in or on a different organism while contributing nothing to the survival of its host


Internal parasite (Ex: Tape worm, round worm)


External parasite (Ex: Leech, tick, mosquitoe)

Food Chain

Series of organisms in which each eats or decomposes the preceding one

Food Web

Complex network of many interconnected food chains and feeding relationships

Trophic Levels

All organism that are the smae number of energy transfers away from the original source of energy (Sunlight) that enters an ecosystem


The amound of usable energy entering one trophic level transferred to the organism at the next trophic level


Represent a transfer of energy

Example of Food Chain

Example of Food Web

Pyramid of Energy Flow

Diagram reprsenting the flow of energy through each trophic level

Water Cycle

Biogeochemical cycle that collects, purifies and distributes the earth's supply of water from teh envrionment to living organism then back to the environment

Carbon Cycle

Biogeochemical cycle that depends on photosynthesis and respiration

Nitrogen Cycle

Biogeochemical cycle that relies heavily on bacteria

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