Does applying oil to a person's hair help to prevent brain damage?

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

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.