Archaeon
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archaeon
(är’kē-ŏn’)
plural archaea
any of a group of microorganisms that resemble bacteria but are different from them in certain aspects of their chemical structure, such as the composition of their cell walls. archaea usually live in extreme, often very hot or salty environments, such as hot mineral springs or deep-sea hydrothermal vents, but some are also found in animal digestive systems. the archaea are considered a separate kingdom in some cl-ssifications, but a division of the prokaryotes (monera) in others. some scientists believe that archaea were the earliest forms of cellular life. also called archaebacterium.
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noun an extinct primitive jur-ssic bird, formerly placed in the genus archaeornis but now thought to be a species of archaeopteryx
- Archaeozoic
. noting or pertaining to the earlier half of the precambrian era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered. the archeozoic division of geologic time or the rock systems formed […]
- Archaezoology
noun the -n-lysis and interpretation of animal remains found at archaeological sites
- Archaic homo
collectively, the very robust, regionally differentiated human populations that lived in europe, asia, the middle east, and africa from 35,000 to 200,000 years ago. any physically robust, premodern form of the genus h-m- , including h-m- sapiens neanderthalensis (neanderthal man) or h-m- erectus , and their intermediate forms and regional variants.
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archaic h-m- sapiens archaic h-m- sapiens (är-kā’ĭk) relating to or being an early form or subspecies of h-m- sapiens, anatomically distinct from modern humans. neanderthals in europe and solo man in asia are usually cl-ssed as archaic humans. though archaic humans belong to the same species as modern humans, not all archaic groups or populations […]