There are (undoubtedly) many ways in which physical geography affects cultural geography. It's not accurate to say that it's possible that physical geography doesn't shape culture. Although that was a school of thought some hundred years ago, it's not a modern geographical argument and it misrepresents a field that combines both social/cultural and physical geography into a single field human geography.

For this question, I think it's also important to consider that physical geography affects language and language groups, religion and religious sects, clothing (related to climate), food culture (what is/is not appropriate as food), etiquette presentations, government and political systems, education, philosophy, work environments (job outlooks), and so much more.

There is a huge amount of debate on how much geography affects culture.  Some think it affects it a lot (this is called geographical determinism) while others think people have complete free will and are not affected by their environment and geography.

You can make many arguments about how geography has shaped Africa's culture.  Here are a few:

• Jungles and deserts make traveling North-South in Africa very difficult and have made it harder to create trade routes.
• The presence of malaria and the tse-tse fly made it difficult in the past to have large populations of people in certain areas of the continent.

Please note that I'm sure your teacher/text has given specific answers that you might be expected to use.  I suggest you look at your text and notes as well.