Answer:
They share common climates and food sources.
Explanation:
The Mediterranean region is located around the Mediterranean Sea. There is an abundance of different people groups and multiple religions in this region. Despite this, the majority of the cultures tend to be very similar, with the people often having almost exact same habits and behavior.
The main reasons for this are the climate and food sources, both of which are shared by most of the people in this region. It is common knowledge that the climate and food sources have been big factors in the type of culture a particular group develops, and it is also very common that different people groups that share the same climate and food sources have very similar cultural traits. This is not something that is typical about the Mediterranean region but can be seen in many other regions such as Scandinavia, Central Asia, the Middle East, etc.