The images in the figure represent aqueous solutions of ionic compounds. Which could correspond to Na2S? 
Definitions:
Proprioceptors
Proprioceptors are sensory receptors located in muscles, tendons, and joints that help to convey information about body position and movement.
Dermis
The dermis is the thick layer of living tissue below the epidermis that forms the true skin, containing sweat glands, hair follicles, and blood vessels.
Epidermis
The external layer of skin that acts as a waterproof barrier and determines our skin color.
Abducens
Refers to the abducens nerve (cranial nerve VI) that controls the lateral rectus muscle of the eye, responsible for abducting or moving the eye laterally.
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