How do cultural traits spread to create culture convergence and divergence?

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

What is the name of the ocean current that affects the british isles? how does it influence their climate?

How did geographic isolation affect the islands in the australasia ecozobne?