He performed an experiment that explain what occurred on primitive earth billions of years ago. He sent an electrical charge through a flask of chemical solution of methane, ammonia, hydrogen and water. This created organic compounds including amino acids 
Hopes this help you.
        
             
        
        
        
Explanation:
meiosis cell are parent cell
 
        
             
        
        
        
Answer:
6 for white parents, and 6 for black parents.
 
        
             
        
        
        
Gravity
Plant roots always grow downward because specialized cells in root caps detect and respond to gravity. This is an example of a tropism. A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism.