A convergent boundary is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other causing a process known as subduction. The subduction zone can be defined by a plane where many earthquakes occur, called the Benioff Zone.
        
             
        
        
        
Answer:
 b. pieces of DNA is the correct answer.
Explanation:
A gene is a piece of DNA and it is present in the nucleus of all cell's 
The function of the gene is to codes for a specific type of protein.
Genes convey the message that determines our characteristics
Genes are called as a functional unit of genetics.
 
        
             
        
        
        
im not positive but i think in the chemical bonds of molicules but id check google first
 
        
                    
             
        
        
        
A
he cross bred them and learned about recessive and dominate traits