The following pictures represent aqueous solutions of three acids HA (A = X,Y,or Z) ;water molecules have been omitted for clarity. 
-Which acid solution has the lowest pH?
Definitions:
Instinct
The innate inclination of a living organism towards a particular complex behavior.
Reflex
An unlearned, involuntary action or movement in response to a stimulus. A reflex occurs without conscious thought.
Cephalocaudal
A principle of development that describes growth and development that begins at the head and progresses downward towards the feet.
Proximodistal
A pattern of development where growth starts at the center of the body and moves towards the extremities.
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