Sexual production requires the sperm and egg cell
        
             
        
        
        
The property of semiconductors that makes them most useful for constructing electronic devices is that their conductivity<span> may easily be modified by introducing </span>impurities<span> into their </span>crystal lattice<span>. The process of adding </span>controlled impurities<span> to a semiconductor is known as </span>doping<span>.</span>
        
             
        
        
        
The transcription process occurs in three stages:
 initiation, chain elongation, and termination.
Transcription is the process in which the information in a strand of DNA is copied into a new molecule of messenger RNA. 
hope that helps :)