Can we forge against these enemies a grand and global alliance, North and South, East and West, that can assure a more fruitful life for all mankind? Will you join in that historic effort? Which rhetorical device does Kennedy use?

i would say the correct answer is not concrete.

the correct order is:

you're your own worst enemy:

they're going to say what they say, but

their opinions aren't holding you

back. it's your self-defeatist

attitude that's keeping your work

from getting its due.

your answer is c) experiments with water vapor showed that elements combine in specific proportions.

what are the choices for abcd