One reason for this is the disappearance of grasslands in the central United States.

VOA: special.2009.05.12

We also will tell about a possible explanation for the mysterious disappearance of bees.

VOA: special.2009.09.22

It explores the political and economic effects caused by the disappearance of honeybees.

VOA: special.2009.03.25

The disappearance of cancer stem cells,then, is important for cancer control.

VOA: special.2010.06.01