Changes in the earth's surface have largely been the result of: a. winds b. glaciers < my answer c. internal forces d. external forces is glaciers the correct choice?

Explanation:

Here your talking about change sin the Earth's surface, in the land, directly, so the events that could do that is Erosion, and this process happens using the wind. So, the wind function as a abrasive file, degrading rocks and surface.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.