Examlex
When a conditioned stimulus can predict the nonoccurrence of an unconditioned stimulus, it is referred to as
Water Vascular System
Unique hydraulic system of echinoderms; functions in locomotion and feeding.
Echinoderms
A phylum of marine animals including starfish, sea urchins, and sea cucumbers, characterized by radial symmetry and a water vascular system.
Digestive System
A collection of organs that breaks down food into nutrients, which the body uses for energy, growth, and cell repair.
Subphylum Urochordata
A subphylum of chordates that includes marine animals known as tunicates or sea squirts, having a notochord only during their larval stage.
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