25 points Doing something for the first time and setting a standard for others to follow is setting a (fraction-precedent)

please help me

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

How does an appellate court differ from a trial court a. an appellate court usually has a jury b. an appellate court decides issues of facts c. an appellate court examines more witnesses d. an appellate court reviews another courts decision