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In what continent would you find a polar desert?
Fossil Fuels
Naturally occurring carbon-based fuels derived from the decomposed remains of ancient plants and animals, such as coal, oil, and natural gas.
Energy Pyramid
For an ecosystem, a graphic depicting the energy that flows through each trophic level in a given interval.
Trophic Level
The rank in the food chain of an organism, determined by the number of energy-transfer steps to that level.
Biomass
The total mass of organisms in a given area or volume, an important energy source and ecological metric for understanding ecosystems.
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