True because Weathering is the process breakdown of materials through physical or chemical actions and Erosion occurs when weathered materials such as soil and rock fragments are carried away by wind, water or ice. Many forces are involved in weathering and erosion, including both natural and man-made causes.This will causes rocks to disintergrate
        
                    
             
        
        
        
D. The heat is there via convection from the sun
        
                    
             
        
        
        
A is the correct answer to the question
        
             
        
        
        
The correct option is A.
The DNA from one specie differ from the DNA of another specie on the basis of their base ratio. The base ratio refers to the percentage of purine to pyrimidine in a DNA molecule. The base ratio is the one that is responsible for the variability that is observed in chromosomes from different species. 
        
                    
             
        
        
        
Answer:
your answer is correct. it is option 3