During which phase do the chromosomes begin to twist and thicken, the nucleus breaks apart, and the chromosomes start to move toward the center of the cell?

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.

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?