If we take any point on the y-axis, then the distance of this point from the y-axis is 0. Therefore, the abscissa of this point is 0.
The co-ordinate of a point on the y-axis are of the form (0, y). Thus, the abscissa of all points on the y-axis is 0.
Abscissa of all the points on y-axis is _____0_____.