Which of the following is the structure of d-galacturonic acid? 
Definitions:
Sensory Adaptation
The process by which sensory receptors become less sensitive to constant stimuli over time, allowing organisms to focus on changes in their environment.
Just Noticeable Difference
The minimal change in a stimulus that can just barely be detected by an organism.
Absolute Threshold
The minimum intensity of a stimulus that can be detected by an organism's sensory systems at least 50% of the time.
Wavelength
The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
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