Final answer:
Mannheim's theories and sociological research suggest that contemporaneous individuals are stratified by various factors, with education and occupation, as well as social class and ethnicity, being significant stratifiers in society.
Step-by-step explanation:
Karl Mannheim's theories suggest that contemporaneous individuals are further internally stratified by various factors. Reflecting on Mannheim's ideas alongside sociological research, one can surmise that while many factors contribute to social stratification, options like gender, age, geographical and cultural location are significant. However, when considering how these factors intersect, we see that options like social class and ethnicity are often highlighted as primary stratifiers within societies. Sociological inquiry shows that age can play a role in how individuals are stratified, as age stratification theory suggests different age groups may have varying access to social resources. Occupation is another major factor, particularly in the context of industrialized societies where social identity increasingly aligns with one's job. Therefore, while not explicitly stated by Mannheim, relevant sociological theories and observations support that contemporaneous individuals may be stratified by various factors including education and occupation, as well as by social class and ethnicity.