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Perform the indicated operations involving rational numbers. Express the final answer in reduced form.
Echinoderms
A phylum of marine animals that includes starfish, sea urchins, and sea cucumbers, characterized by radial symmetry and a unique water vascular system.
Radial Symmetry
A symmetrical arrangement of parts around a central axis, as seen in many aquatic organisms, allowing them to interact with their environment from any direction.
Endoskeleton
An internal support structure of the body, found in vertebrates, consisting of bones and cartilages.
Complete Metamorphosis
A type of insect development that includes four distinct life stages: egg, larva, pupa, and adult, with each stage looking entirely different and serving a different role in the life cycle.
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