Refer to the figure. 
Which animal shown in the figure has arms composed of hard, jointed plates?
Definitions:
Price Elasticity of Demand
A measure of how much the quantity demanded of a good responds to a change in its price; it quantifies the sensitivity of demand relative to price changes.
Percent Change
A mathematical calculation that describes the degree of change over time, expressed as a percentage.
Demand Curve
A graphical representation of the relationship between the price of a good and the quantity demanded for a given period.
Price Ceiling
a legally established maximum price for goods or services, aimed at keeping prices from rising to high levels.
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