The structure is calcium ions.
The primary source of stem thickening in plants is the vascular cambium. It is a plant tissue located between the phloem and the xylem and in the root of a vascular plant. It is the source of secondary growth or the radial growth of the stem of a plant.
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This contains some rude words, Because of that I couldn't write in this platform
I really don’t know what your asking but maybe A reptile