What is the pressure in the gas bulb connected to the mercury manometer shown in the diagram if the ambient pressure is 756 torr? The heights labeled in the diagram are 15 mm and 21 mm. 
Definitions:
Stem Cells
Undifferentiated cells that have the potential to develop into different cell types, used in medical research and treatment.
Differentiate
To recognize or ascertain what makes someone or something distinct or different compared to others.
Cellular Signaling
The complex system of communication that governs basic cellular activities and coordinates cell actions, crucial for the body's functioning and response to the environment.
Differentiation
Involves the process of becoming distinct or specialized in structure or function, often used in the context of cells in biology or elements within a system.
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