Please answer the following question: Given the following passage  "The general effect of the water content upon the wood substance is to render it softer and more pliable. A similar effect of common observation is in the softening action of water on rawhide, paper, or cloth. Within certain limits, the greater the water content, the greater its softening effect.",  answer the following question. Note that the answer is present within the text.  Question: Which effect of water is unique to wood, at least in this context?
A:
pliable