When human populations become too dense and adverse the plants start to excrete nerve toxins killing millions.
The answer is: "how is this happening"?
happening
Happening.
what r happening to whale poppulation! what r happening to whale poppulation!
What is happening to estuaries?
is 666 happening in america
it is happening at Wimbledon
wha is happening to the temperature
How many WAR are happening?
Probability?
what is happening in the world of physics
it is happening in London.