Producer - An organism that converts simple inorganic molecules into complex organic compounds. Most use light to provide the energy to drive the reactions involved.
Consumer - An organism that gain energy from complex organic matter.
Decomposer - An organism that feeds on waste from other organisms, or on dead organisms.
Trophic Level - Each feeding leve in a food chain.
Primary Succession - The changes that result when the starting point is bare, uncolonised land. e.g. samd dunes, lava, lanslides, retreating glaciers.
Secondary Succession - when an established communtiy is destroyed and a new community develops.
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