How are oceans and rivers barriers to human trade, movement, and migration?

check all that apply.

a. they are a natural boundary.
b. they divide landmasses.
c. they can be hard to cross or navigate.
d. they might be hard to get to like the amazon.

Which statements describe cultural influences? florida is bordered by water on three sides. french is spoken in parts of louisiana. forests are cleared to provide space for cattle grazing. male children are encouraged to attend the university. the longest river on the continent is located here. birthdays are celebrated on january 1st. per capita income of northern buckland is more than $100,000.