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Jerry Is a Resident in a Psychiatric Ward

question 144

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Jerry is a resident in a psychiatric ward. When he makes his bed, brushes his teeth, and sweeps the floor, he gets a plastic chip. He can exchange the plastic chips he has earned for extra privileges, such as additional TV time. This example illustrates the basic features of:


Definitions:

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.

Phylum Echinodermata

A group of marine animals characterized by radially symmetrical body plans, a water vascular system, and a calcified skin, including stars, sea urchins, and cucumbers.

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