Since philosophy deals with ideas and people's response to one another, I would think that your professor wants you to think about differences in ideas or likeness in ideas throughout different societies. For instance, the idea of "family" pervades through all societies... although that idea is practiced differently.
This is easy.
1) Review Dante's Divine Comedy, and his kingdoms of Inferno, Purgatory, and Paradise
2) Then, T.S. Elliot's The Waste Land
3) Finally, and most important, T.S.Elliot's The Hollow Man
But I suspect your prof is looking for how you defend your ideas, more than anything.
um this was are first day of philosophy, so i don't know anything you just said bobpursley , i'm just confused in general...im not sure if i talk about that humans are what make up earth, and they have different purposes in life to obtain and stuff like that not sure though im still super confused,
If it's the first day of a new class for you, then your prof wants to see YOUR writing, YOUR thinking. Bobpursley is right, I think, in that your prof is probably looking for how you defend the statements you make.
So basically you can write anything -- just be able to back it up!
read this, and think on it.
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Your idea about people are what make up the earth and their different purposes is a good idea to write about.