Why do you think it is so important for scientists to be able to gather evidence from past to research the effects of climate change on marine ecosystems ?

i think its b

explanation:

the answer is b: 1.4 km/hr

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.