Answer:
Option A, accumulate sulfur as intracellular granules.
Explanation:
Purple sulfur bacteria  belong to the group of Proteobacteria. These probacterias are  anaerobic  in nature and yet are able to photosynthesise. They are usually found in  water environments  such as hot springs, stagnant water etc. They use sulphur (either in the form of sulfide, or thiosulfate) as an electron donor in their photosynthetic activity to oxidise sulfur thereby producing granules of elemental sulfur. 
while filamentous sulfur oxidizers use nitrate instead of oxygen to oxidize sulfide thereby producing granules. 
Hence, option A is correct.
 
        
             
        
        
        
Answer:
Studies have been conducted on synthetic products, including DDT and estrogen. The use of these synthetic products has been discontinued due to increased risk of cancer and other health concerns. Genetic engineering has increasingly been used in cattle, crops, and pharmaceuticals.
Explanation:
 
        
             
        
        
        
Answer:
B. Cellular Respiration 
Explanation:
Because u have to think which one does the samething as photosynthesis 
 
        
             
        
        
        
Http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072434/ 
There is a website with some info. Hope it helps! :)