the opening and closing of the pupil in response to light is an involuntary action controlled by the parasympathetic branch of the autonomic nervous system
I believe that the smallest defined unit of time on the geological scale are ages.
Here are all of them, ranked from largest to smallest: eons, eras, periods, epochs, and ages.
Eons are very large chunks of time which encompass more than 500 years, whereas ages can last from a couple of years to about a hundred.
This is expressed as Moisture Content or Water Content
Most food items have a water content. Even seemingly 'solidified' foods such as a piece of bread or bun have a certain water content in them.
For vegetables and fruits, the water content as a percentage of the weight can be huge.
For example, fruits such as Watermelons contain 92% in every bite with just 6% sugar and 2% fiber by weight.
