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Chapter 3EcologyThe study of organisms with one another and their habitat and surroundings. SpeciesA group or crowd of living organisms able to reproduce.Autotroph/ProducerAn organism that is able to self feed using materials that are organic and most of the time uses photosynthesis.PhotosynthesisThe process in which organisms that are plants uses the sunlight energy along with water and carbon dioxide to produce food for themselves using the organelle, the chloroplast.ChemosynthesisThe process in which organisms synthesise organic compounds using chemical reactions to provide energy.Heterotroph/ConsumerAn organism on the food chain that needs organic compounds for its main source of food.DetritivoreAn organism on the food chain that needs organic waste as its main food source.DecomposerAn organism on the food chain that needs the cells of dead plants and animals as it main source of food.Food ChainA group of organisms that are aligned in a chain to represent the order of each individual’s eating habits from smallest to biggest.Food WebA group of organisms organized in a web-like organization the represent each individuals relationship with another in predator-prey format.Trophic LevelA level in which represents an organism’s hierarchical standing.Ecological PyramidA group of different types of organism arranged in a pyramid to represent the percentage of biomass or bio-productivity at each trophic level.BiomassAn organism’s mass in any given habitat. Biogeochemical CycleThe cycle of chemical substances moves through the biotic and abiotic areas of earth.NutrientA substance that provides food to live on.Primary ProductivityThe productivity at which photosynthetic organisms make organic compounds in their ecosystem.Chapter 4WeatherThe state of a place that represents heat, cold or dryness.ClimateAn area’s weather conditions.Greenhouse EffectThe process of trapping in the sun’s warmth due to the greater transparency of visible radiation.Biotic FactorA living condition that affects a habitat or the organisms inside it.Abiotic FactorA nonliving condition that affects a habitat or the organisms inside it.HabitatAn organism’s natural home and/or environment.NicheA position that is suitable for an organism.ResourceA material that is helpful to use for a particular task or process.PredationThe process of one organism preying on another.SymbiosisThe process of two organisms interacting in close physical living.MutualismA relationship in which two organisms uses each other so that each get benefited.CommensalismA relationship in which one organism uses another organism to benefited while the other is not being affected at all.ParasitismA relationship in which one organism uses another organism so that it can be benefited while the other is being suffered.BiomeA natural, large area full of living organisms and land structure.Chapter 5Population DensityThe measurement of and organisms population in a unit area.ImmigrationThe action of an organism traveling to a different place to fit its living needs.EmigrationThe act of an organism that travels from one place to another to settle.Exponential GrowthWhen a growths rate exceeds more in proportion to the growing total number or size.Logistic GrowthThe growth in which an organism’s growth rate decreases as the population reaches carrying capacity.Carrying CapacityThe number or population of organisms that can be held in any given habitat.Limiting FactorAn environmental factor that limits the growth of any given organism.Density-dependent Limiting FactorAn organism’s population whose effect does depend on the population of that organism.Density-independent Limiting FactorAn organism’s population whose effect does not depend on the population of that organism.Predator-prey RelationshipA relationship between organisms that shows that one is the predator of the other.