How did Marco Polo encourage European exploration?

What are the reasons that some europeans moved and began colonizing the new world? select all that apply: options: better economic opportunities. some were escaping religious persecution. attempting to increase their wealth, despite the hardships and risks. the new world was safer and more secure than the old world.

What impact did entry into ww1 have on life in the us?

"if i have seen farther than others," said newton, "it is because i have stood on the shoulders of giants." who were the giants to whom newton was referring? could this be said of any scientific accomplishment? explain.