The graph displays the number of tickets available (not yet sold) for the number of hours since the theater opened at noon. Calculate the slope for the Play Story line and interpret its meaning. 
Definitions:
Blastula
An early stage of embryonic development in animals, characterized by a spherical layer of cells (blastomeres) surrounding a fluid-filled cavity (blastocoel).
Morula
An early embryo consisting of a solid ball of cells.
Gastrula
A three-layered embryo formed by the process of gastrulation.
Acrosomal Net
A structure in certain sperm cells, derived from the acrosome, that plays a role in fertilization by penetrating the egg's outer layers.
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