Answer: the epidermis of a leaf includes: upper epidermis and lower epidermis but if you are referring to the epidermis of an onion: it is only one layer
10-20 nanometers
It restricts cuticular transpiration
The characteristics of the epidermis help it in playing its role. It has a thick protective layer and it also has tight junctions within the epithelial cells.
Stomata or stoma(plural)stomach
The role that cells play in keeping the stomach from digesting itself is in the production of a thick, greasy mucus so that the stomach wall remains intact. This thick mucus is called glycoprotein.
Coastal plants have plenty of water to absorb and transpire therefore their epidermis does not require water conservation; on the other hand non coastal plants have to conserve water hence their epidermis is thick.
stratum germinativum layer is the deepest layer of five epidermis layer which is the outer covering of skin in mammals. It is a continuous layer of cells which is often described as one cell thick but to the reality it is two to three cells thick in glabrous skin and hyper proliferative epidermis.
because our stomach contains acid and it churns food.
The cuticle. It's usually not that thick, but with succulents, it's really thick and waxy to hold in as much water as possible.
chyme
A cuticle is a protective film covering the epidermis of the leaves. Both the upper and lower epidermis are protected by this cuticle in many leaves, but leaves growing in dry areas have much thicker cuticles, serving as a structural support as well as protection.