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Which of the following is NOT described in the text as one of the four main explanations for the increase in ADHD from 1990 to the present?
Organelle of Locomotion
Cellular structures that enable movement in organisms, such as cilia and flagella.
Flagellum
A long, whip-like appendage that enables many bacteria, sperm cells, and other organisms to swim and move.
Ciliated Cells
Cells that have fine hair-like projections on their surface, which move in unison to transport substances or debris across the cell surface.
Columnar Cells
Elongated cells resembling columns, often found lining organs like the intestines and respiratory tract, where they might secrete or absorb substances.
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