Examlex
What is the number of television commercials-which consist mostly of advertisements for toys, cereal, candy and fast food-that the average child sees per year in the United States?
Tuber
A swollen, fleshy, underground stem or root serving as a storage organ for nutrients, exemplified by potatoes.
Underground Stem
A stem of a plant that grows beneath the surface of the soil, such as rhizomes or tubers, storing nutrients and helping in vegetative reproduction.
Endodermis
The deepest layer of cells within a plant root's cortex, acting as a selective filter that controls the movement of materials from the soil into the vascular core.
Epidermis
The outermost layer of cells in plants and animals, serving as a protective barrier against the environment.
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