No, every human being should compensate the life in any situation.It's the God rule. If you don't believe the god ,then also don't believe the pain.What would you get by killing a person on that reason.Do you remove his pain.No, you are not removing pain but you are taking away the life.

Internet dependent on connection .... TV dependent on physics.. We people dependent on God..

In single circulation blood goes from heart once where as in double circulation blood goes through the heart twice. Ex:fish(single circulation) Ex:Humans(double circulation)