The best answer is B.
Carbohydrates, also known as saccharides , are molecular compounds made from only three elements namely carbon, hydrogen and oxygen.
They are also known as sugars. Some of these sugars are simple molecules called monosaccharides, such glucose made from just one molecule. Other carbohydrate molecules are very large, such as  starch. 
Starch is made up of a large number of monosaccharides namely glucose. Plants use starch as a way to store glucose and also as food in some mitochondrial processes.
 
        
             
        
        
        
Answer:
Option A, option B. Option A and B are specific to retroviruses, although option c and d are also true, they are not specific only to retroviruses. 
Explanation:
Retrovirus is a type of virus that uses RNA as its genetic material. After infecting a cell, a retrovirus uses an enzyme called reverse transcriptase to convert its RNA into DNA. The retrovirus then integrates its viral DNA into the DNA of the host cell, which allows the retrovirus to replicate.
 
        
                    
             
        
        
        
exhalation results mainly from our brain telling our lungs the exhale the Co2 and add more oxygen in our lungs.
        
             
        
        
        
C 
vacuoles absorb water, so like storage
        
             
        
        
        
Answer:
 gleba.
Explanation:
Agaricus deserticola, commonly known as the gasteroid agaricus, is a species of fungus in the family Agaricaceae. ... Unlike other Agaricus species, A. deserticola does not develop true gills, but rather a convoluted and networked system of spore-producing tissue called a gleba.