por qué debido a la gran concentración de población la demanda es mayor y los problemas generados por la escasez de estos servicios se multiplican en las grandes urbes?​

Although this may be the opposite of what you think i will say it anyway. you were brought into this world for a reason and you still have soo much ahead of you. not everybody has an opportunity of living a great life, but it doesn’t give you a reason to end everything. somebody in the world loves you, and imagine what you would do to them if you left forever.

Well, a and b together would be negative. b alone would also be negative.