A arrow pointing in one direction then the other direction
        
             
        
        
        
The cell because they are moving from high to low concentration
        
             
        
        
        
Plants need water to survive! They go through a process called photosynthesis where water and CO2 is converted to food. This is jmportant for the food chain because other animals eat the plants to survive as well!! Hope this helped. 
        
             
        
        
        
Answer:
Chemical evolution is the formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth.
It the first step in the development of life on this planet
HOPE IT HELPS!!!!