Which statement is true about the international space station?
a. it is crewed by astronauts from the u. s. and canada only.
b. it is a satellite of earth.
c. its goal is to collect rock and soil samples from other planets.

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a. the united states declined to assist south vietnam against the north. b. us leaders authorized south vietnam to invade north vietnam. c. the president did not sign the gulf of tonkin resolution. d. congress authorized the president to escalate the conflict.