Salps in the Class Thalacea

question 17

Multiple Choice

Salps in the class Thalacea

• A)are barrel-shaped open-ocean organisms.
• B)have larger transparent bodies.
• C)may be luminous at night.
• D)may occur singly or in long chains.
• E)All of the choices are correct.

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Definitions:

Average Total Cost Curve

A graphical representation showing how average cost changes with changes in output.

Zero Economic Profits

A situation in perfect competition where firms earn just enough revenue to cover their total costs, including opportunity costs.

Marginal Revenue

Marginal Revenue is the additional income received from selling one more unit of a product.

Marginal Decision Rule

A principle that states that an action should be taken if, and only if, the marginal benefits exceed the marginal costs.