Will give brainliest! 20 points! which of these describes how ancient inca civilization modified their environment? a: they fertilized crops and created terraces for farming. b: they built tunnels through mountains and dug irrigation canals. c: they built rope bridges over rivers and built tunnels through mountains. d: they created farmland in marshes and built roads.

sounds like letter A

A: They fertilized crops and created terraces for farming.

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.