Say that I was asked to write an essay on the topic below.
'Investigate and discuss the biology of 'handedness'. Describe the possible causes of right- vs left-handedness. Discuss the history of discrimination against left-handed people and, if possible , compare to discrimination generally against such groups as women, homosexuals, or ethnic minorities.'
How do you interpret the use of 'if possible' above? I mean, Am I given the choice to write on the part that follows 'if possible' or it is a must? If it is a must, why was 'if possible' used?