The use of retroviral therapies can increase the patient's risk of developing cancer because they may integrate recombinant DNA into the genome in ways that may misregulate the expression of genes. Therefore the correct option is D. 
 
<h3>What is retroviral therapy? </h3>
 
Retroviral therapy is an HIV treatment where medicines are taken as prescribed by a healthcare professional. This treatment reduces the amount of HIV in an HIV-infected person. 
HIV does not have a cure but antiretroviral therapy can reduce the risk of potential health issues caused by HIV. 
This treatment can help to control the virus in an HIV-infected person within 6 months. The treatment for HIV cannot prevent the transmission of other sexually transmitted diseases. 
 
Therefore the correct option is D. 
 
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Precipitation would help distribute water all over the earth's surface, which gives animals and humans a source for water. Precipitation also helps plants grow which in turn provides humans with fresh air. Evaporation also benefits the different living organisms on earth by purifying the water. When water evaporates, pollutants are filtered and left behind , which makes it cleaner during precipitation.
        
             
        
        
        
Answer:
Explanation: Wind is a type of dry deposition method. If original soil is erodable and wind exists, soil particles move via wind (sometimes it is called dust transport) and finally are deposited at final destination regions/areas. However, water erosion occurs when rainfall or hail occurs.
Explanation:
 
        
             
        
        
        
Answer:
Ia tidak mempunyai badan fizikal.
Penjelasan:
Jisim udara tidak diukur oleh keseimbangan tuas atau keseimbangan berat yang lain kerana mustahil untuk mengukur jisim udara. Hanya dua sifat udara yang dapat diukur seperti kadar aliran dan tekanan. Imbangan tuas mengukur berat bahan-bahan yang mempunyai badan fizikal sehingga sebab itu jisim udara tidak dapat diukur kerana tidak mempunyai badan fizikal. Udara mempunyai jisim tetapi tidak mempunyai badan fizikal sehingga mustahil untuk mengukur beratnya.