Use the Following Figure and Information to Answer the Question

question 15

Multiple Choice

Use the following figure and information to answer the question.

Fishes that have swim bladders can regulate their density and, thus, their buoyancy. There are two types of swim bladder: physostomous and physoclistous. The ancestral version is the physostomous version, in which the swim bladder is connected to the esophagus via a short tube (see the figure) . The fish fills this version by swimming to the surface, taking gulps of air, and directing them into the swim bladder. Air is removed from this version by "belching." The physoclistous version is more derived and has lost its connection to the esophagus. Instead, gas enters and leaves the swim bladder via special circulatory mechanisms within the wall of the swim bladder.
If a ray-finned fish is to both hover (remain stationary) in the water column and ventilate its gills effectively, then what other structure besides its swim bladder will it use?

• A) its pectoral fins
• B) its lateral line system
• C) its caudal (tail) fin
• D) its operculum

---

Definitions:

Disposable Income

The amount of money an individual or household has to spend or save after income taxes are deducted.

Real GDP

A measure of a country's economic output that accounts for changes in the price level, adjusting for inflation or deflation to reflect the true value of goods and services produced.

Inflation Rate

The rise in the average price level of goods and services within an economy throughout a specific time frame.

Calculating GDP

The process of determining the Gross Domestic Product of a country, usually by adding up total consumer spending, investment, government spending, and net exports.