In the diagram,which is the internal root sheath? 
Definitions:
Grid
A network of intersecting parallel lines, whether imaginary or physical, used for navigation, reference, or as a structural feature in design and planning.
Holistic Perspective
An approach that considers a system, person, or problem as a whole, rather than focusing on its individual components.
Ethnocentrism
The belief in the inherent superiority of one's own ethnic group or culture, often accompanied by a dismissive or negative view of other cultures.
Historical Documents
Written records that provide evidence or information about past events, figures, or societies.
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