This is false.
Common law is a law that is decided on individual cases, that is by decisions on a first case on a given type. This law is used in former British colonies, and the rest of the world uses the Civil law.
The Columbian Exchange connected the Eastern and Western Hemispheres by using same things like food, livestock, and crops.
The house is built on soggy land
Secondary source ( I have no exploration but it is that)