Historically, europe's coastal location and river systems a) have protected europe from invaders. b) have prevented the spread of religion. c) have resulted in trade dominance in recent centuries. d) have contributed to the highest population density in the world.

It is likely C because the water allowed for easy travel and trading!

:D

Bthreatening to ally with germany

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.