How do scientists identify plate boundaries

Volcanic activity 
fault lines
mnt. ranges
and siesmagraphs 

They can be identified in zones where earthquakes occur. The epicenter of an earth quake is usually located on plate boundaries. 

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.