The United States.
O uses almost 25% of the world's energy
is the leading supplier of fossil fuels
Is the most populous country in the world
designed and launched the Mir Space Station

A lot of toxins in a coral reef could influence natural selection so it would become like survival of the fittest. Then the fish would develop certain traits to better protect themselves (less prey means predators would takes bigger measures to get food). This would also cause a decrease genetic variation because there wouldn't be as much fish left. Since the coral reef went from unique to dull from toxins.