tundra - a biome that is cold, dry and treeless, global warming - a rise in Earth's average surface temperature, detritivore - organisms that eat dead organisms, producer - organisms that make their own food, community - all the population living in the same area at the same time, abiotic - non-living factors of an ecosystem, grassland - a biome where grasses are the dominant plant, endangered species - organisms that are close to extinction, carbon footprint - the amount of greenhouse gases emitted by a person, organization, event or product, energy pyramid - a model that shows the amount of energy available in each food chain, symbiosis - a relationship between two or more organisms, desert - the driest land biome, carnivore - animals that only eat other animals, niche - the way an organism interacts with biotic and abiotic factors, carrying capacity - the largest number of organisms an ecosystem can support, omnivore - organisms that eat both plants and animals, clean air act - gives the EPA power to create emissions standards for automobiles to reduce pollutants in the air, taiga - a biome consisting mostly of evergreen trees, renewable resource - a resource that can be replenished faster than it is used, food chain - A feeding hierarchy in which organisms in an ecosystem are grouped, herbivore - organisms that only eat plants,

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