On which cell types do antibodies exist as transmembrane proteins?

Which of the rock examples below is most likely to be metamorphic

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

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.