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In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

What is the 77 element on the periodtic table

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.