Canals are man-made, meaning, they are Human Systems.
Faults are natural, meaning, they are <span>Physical Systems.
Floods are not created by man, meaning, they are </span>Physical Systems.
Bridges are man-made, meaning, they are Human Systems.
I hope this helps!
The olmecs created long- distance trade routes which was used to trade items in which were needed. Due to this the olmec culture spread out to a wider community.The olmec culture also made statues looking like heads from stone here’s and example
They became wealthier by finding gold and sending it back to Europe
(D) a result of poor conditions and treatment like this lead to the formation b of Unions