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Economic theory is necessary and extremely important because of its relationship to economic policy.
Parietal Cells
Cells in the lining of the stomach that produce hydrochloric acid and intrinsic factor, crucial for digestion and B12 absorption.
Goblet Cells
Goblet cells are specialized epithelial cells found in the respiratory and digestive tracts, secreting mucus to lubricate and protect the mucous membranes.
Tube-Within-a-Tube
A body plan characteristic of many animals, where the inner tube represents the digestive tract and the outer tube the body wall, with a cavity in between.
Body Wall
The outermost layer of an organism's body, which provides structural support and protection; in many invertebrates, it consists of a cuticle or exoskeleton.
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