How many hydrogen atoms are needed to complete the following hydrocarbon structure? 
Definitions:
Common Cause
A factor that simultaneously affects multiple variables, leading to an association between them.
Blindness
The condition of lacking visual perception due to physiological or neurological factors.
Glaucoma
A group of eye conditions that damage the optic nerve, often associated with increased intraocular pressure, leading to loss of vision if untreated.
Receptor Cells
Specialized cells that respond to specific types of stimuli, such as light, sound, or chemical substances.
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