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final exam vocab

15 flashcards for Mrs. Brodbeck's Science semester 1 final exam

permafrost soil, rock or sediment that is frozen for more than two consecutive years. In areas not overlain by ice, it exists beneath a layer of soil, rock or sediment, which freezes and thaws annually and is called the "active layer".
estuary the tidal mouth of a large river, where the tide meets the stream
population density the number of individuals in a given area
exponential growth when individuals in a population reproduce at a constant rate - need unlimited resources (J-curve graph)
logistic growth when a population's growth rate slows and stops after a period of exponential growth - happens when a populations gets too large (s-curve graph)
symbiosis any relationship in which 2 species live closely
adaptation any characteristic of an organism which makes that organism better suited to its environment
independent variable a variable whose variation does not depend on that of another
dependent variable a variable whose value depends on that of another
control group the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do
experimental group the group that receives an experimental procedure or a test sample. This group is exposed to changes in the independent variable being tested.
sustainable forestry process of planting young trees after cutting down trees, in order to maintain a constant supply of trees
density-dependent limiting factors depends on the size of the population and becomes a factor when the population is large
density-independent limiting factors affects the population regardless of the size
biodiversity the number of different species in an area
Created by: 20mwagner