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18 Cards in this Set
- Front
- Back
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These life forms used organic compounds from their environment as sources of energy
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heterotropic hypothesis
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Life on Earth was probably assissted by life from outer space.
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Extra-terrestrial hypothesis
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Life began near deep sea vents and the first organisims made their own food from hydrogen sulfide.
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Chemoautorophic hypothesis.
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Group of organisisms that share similar characteristics and breed with one another.
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Species
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The process that generates new species
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speciation
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Occurs when indiviuals within a population become spearated geographically from each other for long periods of time.
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Allopatric speciation
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New species develop without geographical separation
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Sympatric speciation
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The dissapearance of an entire species
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Extinction
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THe extinction of a population from a particular location but not from the entire planet.
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extripation
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found in one or very few locations
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endemic species
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autotrophs convert light energy from the sun into chemical energy through this process
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Photosynthesis
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a light absorbing pigment and the pigment that makes plants green.
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chlorophyll
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Oxygen level below 2-3 mg/L
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hypoxic
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no oxygen
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anoxic
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Energy moves throguh a community as organisms feed on one antoher.
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Food chain/web
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A simplified, linear representation of energy flow.
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food chain
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more complex and realistic and shows a varitey of possible flow paths.
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food web
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position in the feeding hiearchy.
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trophic level
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