Research 3 ways in which an ecosystem can be changed by human management and EXPLAIN each one. Please help me :(

Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast. 

"the socialist system that had been in place had brought economic ruin to the country." i hope this !

The second one. this is because the crust is thin, while the mantle is the thickest layer. also, the core is the highest in temperature because of all the pressure from the other layers, so it's solid iron and nickel.