How is the aquatic ecosystem threathed?

Question

in what ways are the aquatic ecosystem threathed?...like oil spills etc....

Answer 1

Water pollution.

With the emissions of certain gasses such as CO2 when it condensates and becomes acid rain which falls back to the Earth's surface.  This slowly turns the water into acid.  There are a lot of aquatic creatures that are very sensitive to the pH of the water such as phytoplankton.  If this dies off then the aquatic ecosystem will be shattered.

There are also a lot of acute pollution in the water such as spilling oil and waste.