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The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Apart of an ecosystem that can restrict the growth of a population is referred to as