What type of diffusion describes how the number of people that possesses a particular culture trait increases?
relocation diffusion
expansion diffusion contagios diffusion
hierarchical diffusion

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

Combine like terms. do not forget to use the distributive property to simplify the first term. 2(3y + 5k) - 2k

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer