What do humid subtropical climates and marine west coast climates have in common?

both are very moist

Explanation:

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )