Tolerance - The range of conditions a species can survive in, Niche - A species' "job" or role in its environment, Resources - Things organisms need to survive (food, water, space), Competition - When organisms try to use the same limited resources, Intraspecific Competition - Between members of the same species, Interspecific Competition - Between different species, Competitive Exclusion Principle - No two species can occupy the exact same niche, Predation - When one animal eats another, Herbivory - When an animal eats plants, Keystone Species - A species that has a big impact on its ecosystem, Symbiosis - Close relationship between two species, Mutualism - Both species benefit, Parasitism - One benefits, one is harmed, Commensalism - One benefits, the other is unaffected, Biomes - Large regions with similar climate and ecosystems, Shifting Mosaic - Different parts of an ecosystem recover at different times, Direct Impacts - Deforestation, agriculture, pollution, Indirect Impacts - Climate change affecting ecosystems globally, Ecology - The study of living things and their environments, Energy pyramid - Way of showing how energy moves through a food chain,

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