Which of the Following Have Distinct Central Disks and Long

question 8

Multiple Choice

Which of the following have distinct central disks and long, flexible arms?

• A)class Crinoidea (sea lilies and feather stars)
• B)class Asteroidea (sea stars)
• C)class Ophiuroidea (brittle stars)
• D)class Echinoidea (sea urchins and sand dollars)
• E)class Holothuroidea (sea cucumbers)

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Definitions:

Labor Supply Curve

A visual chart that displays how the wage rate correlates with the amount of labor that workers are prepared to offer.

Substitution Effect

The economic principle that as prices rise, consumers will replace more expensive items with less costly alternatives.

Income Effect

The impact that changes in either personal or economic income have on how much of a good or service is sought after.

Quantity of Labor

The total hours of work or number of workers employed by a firm or within an economy, which can influence production output levels.