metion two functions of lower epidermis
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Digestive Action of Saliva
The acinar cells produce an enzyme called ptyalin, or salivary amylase, which is involved in the digestive process initiating the hydrolysis of starch present in food.
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Guard Cells and Stoma
The most important structure on a leaf's lower epidermis is the mouth-shaped opening called the stoma. There are many stomata on each leaf - up to one million per square centimeter, and they have two main functions: to regulate gas exchange and to help prevent water loss.
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