Scientific concepts can be explained through a. oral communication b. drawing c. writing d. all of these

D. All of these

Explanation:

Science consists of a set of practices, such as contrasting hypotheses, conducting experiments, proposing explanations or constructing models and theories. Theorization consists in turn of other practices, such as conceptualization, or coinage of new concepts. With them, scientists formulate laws, and by combining laws they generate theories, which can be grouped into groups of scientific theories or disciplines. For example, with the concepts of mass, force, attraction and distance the famous law of Newton's gravitation etc. is formulated.

your answer is

relations between the soviet union and the united states were driven by a complex interplay of ideological, political, and economic factors, which led to shifts between cautious cooperation and often bitter superpower rivalry over the years. the distinct differences in the political systems of the two countries often prevented them from reaching a mutual understanding on key policy issues and even, as in the case of the cuban missile crisis, brought them to the brink of war.

the united states government was initially hostile to the soviet leaders for taking russia out of world war i and was opposed to a state ideologically based on communism. although the united states embarked on a famine relief program in the soviet union in the early 1920s and american businessmen established commercial ties there during the period of the new economic policy (1921–29), the two countries did not establish diplomatic relations until 1933. by that time, the totalitarian nature of joseph stalin's regime presented an insurmountable obstacle to friendly relations with the west. although world war ii brought the two countries into alliance, based on the common aim of defeating nazi germany, the soviet union's aggressive, antidemocratic policy toward eastern europe had created tensions even before the war ended.

answer; ///i believe that the correct answer is (a) the great depression