How can different perspectives provide new insights into a subject?

The early history of the generation and use of steam”appeals mainly to? ethos logos pathos a combination of logos and ethos

Which lines from the speech best supports this topic sentence? and as we walk, we must make the pledge that we shall always march ahead. we cannot turn back. there are those who are asking the devotees of civil rights, "when will you be satisfied? " and they have come to realize that their freedom is inextricably bound to our freedom. we cannot walk alone. we refuse to believe that there are insufficient funds in the great vaults of opportunity of this nation. and so we've come to cash this check, a check that will give us upon demand the riches of freedom and the security of justice. and so let freedom ring from the prodigious hilltops of new hampshire. let freedom ring from the mighty mountains of new york. let freedom ring from the heightening alleghenies of pennsylvania.

Asymbol always — a. gives human qualities to nonhuman things b. uses a connective word such as like or as c. stands both for itself and for something else d. presents an apparent contradiction that is actually true