This kind of organization is termed subject-by-subject organization.
 

Subject-by-subject organization                     Point-by-point organization
 
T.S. Although…                                             T.S.
I.                   Doctors                                                     I.     Respect by the community
A. Respect by the community                    A. Doctors
B. Salary                                                     B. Teachers
C. Career choices
II.    Teachers                                                 II.   Salary
A. Respect by the community                   A. Doctors
B. Salary                                                    B. Teachers
C. Career choices                               
III.  Career choice
A. Doctors
B. Teachers
 
The first method is better for shorter, less complex topics but the second one may be better for longer, more complex topics.
 
Indicators of comparison and contrast:
 
Comparison

both…and           similar to      resemble                     similarly
as …as                 identical to   have…in common      correspondingly        
the same as          alike              liken (to)                     likewise
        just as                  like              
 
        first, second, third, last/finally
 
Contrast
 
        whereas        however                     in spite of     differ            -er ... than…      
        while            nonetheless          unlike           contrast       more ... than                      although             conversely            on the contrary                  different from
        but                                            in contrast                         rather than
        first, second, third, last/finally
                    

Cause and effect

 
Another method of developing a paragraph is to show