When is it o. k. to shift tenses in a sentence?

Experiments were conducted to try to teach chimpanzees sign language

How do we change our profile picture?

Read the excerpt from suffragists' "great demand" banner. in 1917, more than one thousand women stood before the white house in a cold, pouring rain, holding silent vigil to demand a constitutional amendment to extend the vote to them. their quest to be enfranchised by law was known at the time as the great demand. the smithsonian's great demand banner, as it came to be called, declares in bold words and style the determination of the women who made and carried it. their campaign on behalf of women sought to move america one step closer to fulfilling the nation's long-deferred promise of equality under the law. which statements about this excerpt are correct? check all that apply.