Hyaluronic acid is a viscoelastic gel and offers lubrication in the knee joints under stress. The lubrication property of the viscoelastic gels decreases with tune. What properties (i.e. parameters representing material characteristics) of these gels change over time? Explain this feature m terms of stress relaxation and creep behavior. (Assume that hyaluronic acid follows linear viscoelastic behavior) To characterize the viscoelasticity, you are asked to construct a curve by plotting Relaxation modulus at different temperature ranges for a given polymer and compare it to the relaxation modulus curve with respect to time. Draw the curves and explain how they are related to each other.