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10 cards from this deck
Open system - exchanges both energy and materials
One-way path, ultimately lost as heat (not cycled)
Green plants w/ chlorophyll making own food via photosynthesis
Animals that cannot make own food, must eat other organisms
Herbivores that feed directly on producers/plants
Break down dead organic matter, release nutrients back to soil
Less than 2%
More than half (over 50%)
Maintenance - respiration & maintaining their bodies
Mass of living tissue in organisms
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