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The waxy protective covering of a land plant is called a cuticle.
The protective covering over some nerve cells is called the myelin sheath.
Seed coat or testa.
parietal layer
Protective covering flat shaped epithelial are called squamous cell .
This is called a bud scale.
The outermost layer of the skin is called the epidermis.
For plant cells, they have a cell membrane and covering the cell membrane is a cell wall. The cell wall is for the structure of the plant. For animal cells, they just have a cell membrane.
yes the correct answer is skin cells.
They are called "scales" and they overlap one another, all in the same general direction, to provide some limited protection against other fish and predators.
rubbing it against a sharpening stone i think called pyrite (spelling) or leather
when rubbing two objects together it is called fricton