Has done to someone is response to harm * person who holds extreme views in political or religious matters
sympathetic pity and concern for the sufferings or misfortunes of others
a person who is believed to speak for God
the study of the nature of knowledge, reality and existence
the we of physical force se store, abuse damage or destroy
reasonable dislike of a particular group of people or things​

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

c. heat from the poles back down towards the equator.