Which chemicals were formed in the brownish liquid in the flask and why was this significant?

 The Miller-Urey Experiment

He based his calculations on the (then) widely held view that the early atmosphere was reducing, and concluded that the main constituents were methane (CH4), ammonia (NH3), hydrogen (H2), and water (H2O).

answer: every time you get a disposable straw, it eventually gets thrown away. many of these straws, along with other plastic trash, ends up in the ocean, where it can harm or kill sea turtles and other marine wildlife. straws can get up a sea turtle's nose, or a sea turtle can eat the straw, because it thinks it's food.

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.

: -)