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Ecology The study of the interactions between living and nonliving things Population A group of interbreeding organisms coexisting together Community A group of populations living and interacting in the same area Ecosystem An association of living organisms and their physical environment Biome A group of ecosystems classified by climate and plant life Primary consumer An organism that eats producers Secondary consumer An organism that eats primary consumers Tertiary consumer An organism that eats secondary consumers Ecological pyramid A diagram that shows the biomass of organisms at each trophic level Biomass A measure of the total dry mass of organisms within a particular region Transpiration Evaporation of water from the leaves of a plant Watershed An ecosystem where all water runoff drains into a single body of water Greenhouse effect The process by which certain gases (principally water vapor, carbon dioxide, and methane) trap heat that would otherwise escape the earth and radiate into space