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The Selective Service System (SSS) is an independent agency of the United States government that maintains a database of registered male U.S. citizens and other U.S. residents potentially subject to military conscription (i.e., the draft). Although the U.S. military is currently an all-volunteer force, registration is still required for ...
Russian Language and Culture (discontinued 2010) v. t. e. Advanced Placement (AP) Biology (also known as AP Bio) is an Advanced Placement biology course and exam offered by the College Board in the United States. For the 2012–2013 school year, the College Board unveiled a new curriculum with a greater focus on "scientific practices".
Stabilizing selection (not to be confused with negative or purifying selection [ 1 ][ 2 ]) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value. This is thought to be the most common mechanism of action for natural selection because most traits do not appear to change drastically over ...
The Selective Service Act of 1948 was originally intended to remain in effect for two years (i.e., until June 24, 1950), but was extended multiple times, usually immediately before its two-year period of effectiveness was due to expire. Provisions of the law relating to the authority to induct men into the military expired on July 1, 1973.
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
In biology, adaptation has three related meanings. Firstly, it is the dynamic evolutionary process of natural selection that fits organisms to their environment, enhancing their evolutionary fitness. Secondly, it is a state reached by the population during that process. Thirdly, it is a phenotypic trait or adaptive trait, with a functional role ...
Assay. An assay is an investigative (analytic) procedure in laboratory medicine, mining, pharmacology, environmental biology and molecular biology for qualitatively assessing or quantitatively measuring the presence, amount, or functional activity of a target entity. The measured entity is often called the analyte, the measurand, or the target ...
Advanced Placement (AP) examinations are exams offered in United States by the College Board and are taken each May by students. The tests are the culmination of year-long Advanced Placement (AP) courses, which are typically offered at the high school level. AP exams (with few exceptions [ 1 ]) have a multiple-choice section and a free-response ...