Question

How has the introduction of brown tree snakes affected the island of Guam?

Answer 1

it affected the trees and the whole ecosystem. 

Answer 2

The answer to this is Invasive species. Shortly after World War II, and before 1952, the brown tree snake was accidentally transported from its native range in the South Pacific to Guam, probably as a stowaway in ship cargo or by crawling into the landing gear of Guam-bound aircraft.

I hope this helps!!!!!!