The following pictures represent solutions of CuS,which may also contain ions other than Cu2+ and S2- which are not shown.Gray spheres represent Cu2+ ions and dotted spheres represent S2- ions. 
-If solution (1) is a saturated solution of CuS,which of solutions (2) -(4) are unsaturated?
Definitions:
PKU
Phenylketonuria, a rare inherited disorder that increases the levels of a substance called phenylalanine in the blood, requiring a strict diet to prevent intellectual disability and other health problems.
Intellectual Disability
A condition characterized by significant limitations in both intellectual functioning and adaptive behavior, which includes many everyday social and practical skills.
Myelination
The process of forming a myelin sheath around the nerves to improve the speed and efficiency of electrical signals transmission in the nervous system.
Medulla
An essential section of the brainstem involved in controlling autonomic functions such as heartbeat and breathing.
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