They change shape due to a number of reasons.
The easiest reason to understand why they change is that they erode.
The coasts around the the world erode due to waves hitting cliffs, the wind batting against the coasts etc. Over a long period of time we can see that they change in shape.
(sorry I don't know why they move)
        
             
        
        
        
Answer:
See explanation
Explanation:
                                                                                              65, P.H. Road,
                                                                                              Mangalore,
                                                                                              December 6, 2020.
The manager,
Ds Phone Center,
Mount Road,
Mangalore.
  Sir,
     NOTICE OF A PROBLEM DEVELOPED BY AN INFINIX HOT 9 MOBILE PHONE PURCHASED FROM YOUR SHOP 
       On 6th November, 2020, I purchased an Infinix Hot 9 mobile phone from your shop, Ds Phone Center located at Mount Road, Mangalore.
         
        A few days ago, I discovered that the keys on the phone screen no longer respond instantly when touched. I suspected that the phone may have developed a problem in its touchpad but i decided to observe the phone further before I lodge any official complain. However, as the days went by, the problem worsened. Today, the keys on the phone screen no longer respond when touched.
      In order to verify my claim, I have attached the receipt issued to me when I purchased the phone alongside my warranty certificate. I humbly beseech you to replace the phone or rectify the defect accordingly as clearly contained in the warranty certificate.
     Thanks in anticipation of your prompt positive response.
          
                                                                                             Yours Faithfully,
                                                                                              ПДЛ
                                                                                              Umesh/ Urmila
 
        
             
        
        
        
B.)
The 2 sentences should be turned into one because if the last sentence is left like that, it would be called a fragment/incomplete sent.
        
             
        
        
        
Answer:
You have to show us what the paragraph is?
Explanation: