- 行业: Education
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Founded in 1946, Palomar College is a public two-year community college in the city of San Marcos, located in north San Diego County, California. Palomar offers over 300 associate degree, certificate programs and is designated by the U.S. Department of Education as an Hispanic-Serving Institution ...
An impairment of vision caused by the lenses of the eyes becoming cloudy. Cataracts are common in elderly people. They may be inherited or caused by diabetes and environmental factors.
Industry:Anthropology
An immature female sex cell. These egg precursor cells, or primary oöcytes, are produced before birth. They become secondary oöcytes usually one by one after puberty when hormones trigger ovulation.
Industry:Anthropology
An illness that lasts for a long period of time or indefinitely. In contrast, an acute disease is one with a rapid onset and a short but usually severe course.
Industry:Anthropology
An extremely rare genetically inherited condition in which babies are born with extremely small brains and heads. This fatal condition has been found only among the children of 23 Old Order Amish families in Lancaster County Pennsylvania.
Industry:Anthropology
An experimental dating technique based on the fact that organic carbon in soil humus and charcoal progressively convert to oxidizable carbon over time. The ratios of these two forms of carbon vary directly with the age of the material. This technique requires an inexpensive chemical analysis procedure. The effective time range for OCR dating has not yet been established.
Industry:Anthropology
An evolutionary history in which a species remains essentially unchanged for hundreds of thousands or even millions of years and then experiences short periods of very rapid evolution. The punctuated, or rapid change periods, are the result of major environmental changes in predation pressure, food supply, climate, etc. During these times, natural selection may favor varieties that were previously at a comparative disadvantage. The result is an accelerated rate of change in gene pool frequencies in the direction of the varieties that became the most favored by the new environmental conditions. See phyletic gradualism.
Industry:Anthropology
An enzyme produced by mammals to break down lactose in milk that they consume. Lactase is needed for the digestion of uncooked dairy products. Lactase deficiency results in diarrhea and other symptoms of physical intolerance of most dairy products.
Industry:Anthropology
An early form of the species Homo habilis. In an alternate interpretation, some researchers consider Homo rudolfensis to be the species that immediately preceded Homo habilis in our line of evolution. Homo rudolfensis fossils date 2. 4-1. 6 million years ago.
Industry:Anthropology
An early form of the species Homo erectus from East Africa. In an alternate interpretation, some researchers consider Homo ergaster to be the species that immediately preceded Homo erectus in our line of evolution. Homo ergaster fossils date about 1. 8-1. 5 million years ago.
Industry:Anthropology
An artifact type that was made by a particular culture during a limited time period. When discovered clearly in association with ancient humans in an archaeological site, they are an indication of at least the relative time of the occupation. When the independent dating of the artifact types is reliable, this can be considered a calibrated relative dating method.
Industry:Anthropology
