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group of the same kind of organism (same species) living in a certain place at the same time
bacteria that can use nitrogen in the atmosphere to make nitrogen compounds that other organism CAN use
organism that makes its own food using either sunlight energy (photosynthetic) or chemical energy (chemosynthetic)
way of showing how energy moves through a food chain. The same pyramid can show biomass.
a series or chain of organisms showing feeding relationships. Arrow points to belly of receiver ----> going into the belly
Species that enter new ecosystems and multiply, harming native species and their habitats. Non-native
The entire range of resource opportunities an organism is potentially able to occupy within an ecostystem
organisms that break down wastes and dead organisms and return raw materials to the environment
Process that releases energy by breaking down food molecules in the presence of oxygen:
Organism in a food chain that represents a feeding step in the passage of energy and materials through an ecosystem
The cycle in which nitrogen gas is changed into forms of nitrogen that plants can use
The gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established
The series of changes that occur in an area where no ecosystem previously existed - Starts on bare rock
The series of changes that occur after a disturbance of an existing ecosystem - Starts on Soil
The first species to live in an area of primary succession; usually lichens (alice algae lichen freedy fungus)
A stable, mature community that undergoes little or no change in species over time.
Prairies, steppes, pampas, veldts; near the equator, characterized by treeless areas and tall grasses.
Occurs when a toxic pollutant that is not excreted accumulation in the body and appears in highist concentration at the top of the food chain. It's pyramid is upside down.
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