The process by which unspecialized cells become specialized cells is called

The process by which unspecialized cells become specialized cells is called differentiation or cellular differentiation.

Explanation:

The stem cells or the pluripotent cells are capable of giving rise to all cells present in the body of an organism. In the embryonic life, the stem cells are divided further into different cells. These cells are initially unspecialized, later, they become specialized to form a specific cell or tissue, this specialization of the cell is referred as differentiation or cellular differentiation.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

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.