The cells thought to aid in the sense of touch are

Merkel cells are the cells thought to function in the sense of touch.  These cells are necessary for light touch sensation.  In humans, plenty can be found in highly sensitive areas of the skin such as the fingertips. They are also known as tactile epithelial cells.

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blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.

which fault and or fold did you find most difficult to diagram