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Homologous Trait
Conserved traits among organisms with a common ancestor
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Phylogenetic tree
A diagrammatic representation of genetic distances between populations, species or higher taxa
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Chemoautotroph
A simple organism, such as protozoan, that derives its energy from chemical processes rather than photosynthesis
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Heterotroph
An organism that is incapable of synthesizing its own food and, therefore, must feed upon organic compounds produced by other organism
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Chemoheterotroph
An organism that uses oxidation of organic molecules to generate energy
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Bacteria
A single celled organism with no nucleus
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Halophile
An organism that lives in a high saline environment
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Methanogen
Organisms taht produce methane as a result of metabolism in an anoxic environment
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Thermus Aquaticus
A species of bacterium that can tolerate high temperatures and is the source of the heat-resistant enzyme Taq DNA Polymerase
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Prokaryotes
Tiny unicellular organisms that don't have a nucleus or organelles
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Clonal Cell Division
After division, instead of separating, cells stay attached to each other and differentiate
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Metazoa
A major group of mostly multicellular, eukaryotic organisms, their body plan eventually becomes fixed as they develop, most are motile and all are heterotrophs
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Bilateral Symmetry
Only one plane will divide the organism into mirror image halves
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Pentaradial Symmetry
Symmetry in five planes. Each plane is identical. Often seen in Star Fish
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Cambrian Explosion
This mass radiation of species diversity marks the beginning of a major division in geological time known as the Phanerozoic
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