Make a list of central ideas presented by Du Bois in chapter 1 of the souls of black folk.

answer: librarians is the correct word.

i think the first one, it makes the most sense.

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.

the right answer is b