Answer is A 
Firstly axon must reach the threshold level and then depolarisation occurs. Depolarisation phrase means sodium enters and potassium leaves the axon . Choice C can't be because main idea is the entering of sodium ions.
        
             
        
        
        
DescriptionSustainable agriculture is farming in sustainable ways, which means meeting society's present food and textile needs, without compromising the ability for current or future generations to meet their needs. It can be based on an understanding of ecosystem services.
        
                    
             
        
        
        
Answer:
Wind ward side 
Explanation:
The mountain is made up of rocks which supports little amount of plant life.The wind ward side is most suitable for the growth of plant life due to the area being associated with majority of the wind. This wind movement causes an increase in atmospheric humidity and precipitation in the atmosphere which falls on the wind ward side of the mountain. The water and humidity encourages the growth of plant life.
 
        
                    
             
        
        
        
The answer is D because it provided atp to transform to energy
        
                    
             
        
        
        
What are the statements? We can’t say which is true if we don’t know what the statements are