X is the dominant allele / curly hair , females have two X chromosomes and males have an X and  Y
        
             
        
        
        
O D the seasonal movement of organisms between locations mark me as brilliants
        
             
        
        
        
Though there's no question in the statement above I would assume that you are asking about the pH of the water that is acidic. The correct statement would be:
Any liquid that has a pH less than 7 is called acidic, a pH above 7 is basic or alkaline. 
The water in the swimming pool has a high acid concentration due to the chlorine which causes the effect of redness in the eyes. 
        
             
        
        
        
The rock cycle<span> is a model that describes the formation, breakdown, and reformation of a </span>rock<span> as a result of sedimentary, igneous, and metamorphic processes. All </span>rocks<span> are made up of minerals.</span>
        
                    
             
        
        
        
Answer:
The correct answer is -  Rotate the types of crops grown.
Explanation:
Crop rotation is the practice of growing the different types of crops sequentially on the same field to improve nutrients in the soil for better soil health and helps in fighting pest and weed pressure.
Different crops required different nutrients and therefore, rotating crops helps to not exploiting the same nutrients again and again. Rotating crops also helps in removing weeds and pests as different weeds and different pests associate with different crops.