Pick one to answer:
1.What is a ritual? Discuss the four main categories of ritual.Provide
an example of each type of ritual.
2.What are the major systems of social stratification
cross-culturally?How do they resemble and differ from one another?

I need the answer before 12:00 Monday 11 November 2002.

Hmmm, four categories of ritual?  I think perhaps there is some
textbook, lecture notes or similar pertaining to your course, which
divides rituals into four categories and to which you need to refer,
because there will be a subjective element to any such categorization.
 Some suggestions forming five categories, given as a suggestion for
further exploration to you or a researcher working on this question:
(a) ritual as a way to appease a god -  for example rituals of
sacrifice, eg Aztecs offering the heart of a sacrificial victim, (b)
ritual to honour a god, eg the Roman Catholic service of "Benediction"
which centres around the adoration of the eucharistic host, (c) ritual
to mark moments of transition in a person's life, eg ceremonies of
baptism, marriage, burial, (d) ritual to effect an internal change, eg
the rituals of magical orders such as the Golden Dawn, (e) ritual to
effect an external change, eg the rain dances of African tribal
society.