How do the three isotopes Sn-116, Sn-118, and Sn-119 differ?

Which taxon group is more specific, in regards to organisms that are in that group? mammalia animalia

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.

What are the formed elements (cell or parts of cell) in blood and what are their functions ?