Examlex
A null value is used to represent the zero digit in a relation.
Cnidarian
Radially symmetrical invertebrate with two tissue layers; uses tentacles with stinging cells to capture food.
Cnidocyte
Stinging cell unique to cnidarians.
Polyps
Abnormal growths of tissue projecting from a mucous membrane, commonly found in organs such as the nose or intestines.
Closed Circulatory System
A circulatory system where the blood moves through the body in closed vessels, ensuring efficient transport of nutrients and oxygen to cells and removal of waste products.
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