In 2011 about 64 percent of the world's human population had access to sanitation facilities. which of the following has played the greatest role in increasing access to sanitation worldwide

working together

Working together to promote the sanitisation worldwidely in groups or teams has played greatest role in increasing access to sanitisation worldwide.

By promoting sanitisation technique, process and providing Sanitisation material to the people that are not aware has been done by many governmental and non governmental organisations since last some years. These initiatives mainly are the reason that now people have more access to sanitisation these days and are more concerned. The education to children also has played important role in the same.

answer; /// i do believe its (heredity); good luck