An imbalance in the food chain. If they have no predators and the environment is acceptable they will flourish. Lake Michigan is a prime example.
Answer:
Ancient Greece left a long standing mark on our modern world. For example, by developing new government systems like democracy, architecture, sports, beautiful arts, theater, philosophy, and more.
Hello there!
I believe it was the Union Pacific Railroad.
I hope this is part of the options. Best of luck!