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20 Cards in this Set
- Front
- Back
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What is a biome
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a climatic and geographically defined area
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What is the littoral zone
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the area from the shore of the lake to the point where the plants don't grow on the body
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What is commensilism
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it is a symbiotic relationship which one organism is not harmed and the other gains
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What are three factors affecting terresrtial ecosystems
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amount of organic matter in soil
amount of overall preciptiation average tempertature amount of sunlight |
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What is Biotic Potential
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Maximum nuber of offspring a species can produce
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What is External Limits
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Factors that prevent popultions from reaching thier biotic potential.
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What is Density Dependent
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Any factor that changes the birth and death rates as population grows
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What are factors of density dependence
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competition for food and space
interfering; crowding , toxic wastes increase in predator or parasite populations indirect effect: territoriality, behavioral or genetic changes |
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what is density independence
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Any factor that changes the population density regardles of size
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What are factors of densty independence
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Enviromental Resistance
Temperature Range Sun Exposure Salinity Available Gases |
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What are selective pressures
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enviromental forces that result in the survival of organsims with characeristics tat provide resistance
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What is paleontology
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the study of fossils to find age
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What is relative dating
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the deeper the fossil is the older it is
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What is absolute dating
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Using volcanic ash has radioactive isotopes and using their half-lifes to determine the age of the fossil
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What is the supercontinent
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Pangeaa
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What are anatomical structures
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many organisms share a unity plan and have common ancestors
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What are homologous structures
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common in structure and common ancestors
(dophin flipper and human hand) |
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What are analogous structures
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similar function but differ in anatomy not same ancestrail structures
(Bat wing and fly wing) |
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Who proposed the first theory of evolution
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Jean Babtiste Lamarck
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What is speciation
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the creation of new species
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