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Definitions (203)
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acanthodians
Now extinct, earliest group of fish with jaws, ranging from the Silurian to the Permian.
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bedding plane
A surface separating layers of sedimentary rocks and deposits. A bedding plane marks termination of one deposit and beginning of another of different character, such as a surface separating a sandston [..]
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fungi
A group of organisms comprising the kingdom Fungi within Domain Eukarya
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abyssal plain
Large area of extremely flat ocean floor lying near a continent and generally over 4 km in depth.
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acritarchs
Organic-walled microfossils common throughout the Proterozoic and early Paleozoic
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adaptation
Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment. Also used to describe the process of genetic change within a population, as influence [..]
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adaptive radiation (also & radiation&
The diversification, over evolutionary time, of a species or group of species into several different species or subspecies that are typically adapted to different ecological niches (for example, Darwi [..]
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agnathans
A jawless, heavily armored fish that appeared in the Devonian.
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algae
Photosynthetic, almost exclusively aquatic, nonvascular plant-like organisms that appeared in the Precambrian and that range in size from simple unicellular forms to giant kelps.
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allele
One of the alternative forms of a gene. For example, if a gene determines the color of eyes, one allele of that gene may produce brown eyes and another allele produce blue eyes. In a diploid cell ther [..]
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