What is unusual about the cell walls of acid-fast-positive bacteria that makes them difficult to stain without heat

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 is the average speed of a car that traveled 300.0 miles in 5.5 hours

Which of these is not a nucleotide base found in dna?