<span>Russell's case  (two illnesses: bipolar disorder and substance use disorder) illustrates </span>comorbidity. The term comorbity is used in medicine to denote a presence of two diseases or disorders, one primary and one additional, both occurring at the same person.  
        
             
        
        
        
Answer:
<h2>
merocrine, sebaceous, and apocrine</h2>
Explanation:
Merocrine: merocrine sweat glands are widely distributed across the body surface,
Sebaceous glands are located where hair follicles have existed,
apocrine sweat glands are found only in a few areas like axilla. Apocrine -are restricted to specific areas like the axilla, nipple of the breast, pubic region and around the anus area etc.
 
        
             
        
        
        
Explanation:
A stem cell is a cell with the unique ability to develop into specialised cell types in the body. In the future they may be used to replace cells and tissues that have been damaged or lost due to disease.
 
        
             
        
        
        
Organisms at point C will have hair.<span> All organisms on the main right branch will have bilateral symmetry.</span><span> All of the organisms from point B on are terrestrial.</span>
        
                    
             
        
        
        
The correct answer would be B