Read the sentence from “Two Great Scientists.” He questioned scientific concepts—he only trusted them after he tried the experiments himself.

What is another word for concepts as it is used in the sentence?

A.
actions

B.
ideas

C.
jobs

D.
papers

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire