A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish. 
-Which drawing best shows the approximate level of the mercury in the tube when a vacuum pump is connected to the top of the tube,the stopcock opened,the tube is evacuated,the stopcock is closed,and the pump is removed?
Definitions:
Reflexes
Automatic, involuntary responses to stimuli, such as the knee-jerk reaction, that are mediated by the nervous system.
Cranial Nerves
Twelve pairs of nerves that emerge directly from the brain and the brainstem, facilitating various functions including sensory input and motor output.
Cerebral Cortex
The outer layer of neural tissue of the cerebrum of the brain, playing a key role in memory, attention, perception, cognition, awareness, thought, language, and consciousness.
Sensory Cortex
A region of the cerebral cortex involved in receiving and interpreting sensory information from various parts of the body.
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