Choose the One Most Appropriate Letter for Each

question 19

Multiple Choice

Choose the one most appropriate letter for each.
-placoderms

• A)cartilaginous skeleton; jaws
• B)reptile with four-chambered heart
• C)separate openings for the urinary, reproductive, and excretory systems
• D)legless amphibian
• E)invertebrate chordate; no metamorphosis
• F)endotherm with feathers
• G)limbless reptile
• H)most primitive fishes with jaws; extinct
• I)modern-day parasitic jawless vertebrate
• J)North America's only native marsupial
• K)adults are barrel-shaped and secretes a covering of polysaccharides
• L)egg-laying mammal
• M)swim bladder for buoyancy
• N)larvae typically have gills and develop lungs as they mature

---

Definitions:

Fixed Cost

Any cost that in total does not change when the firm changes its output.

Firm's Output

The total quantity of goods or services produced by a company within a specified period.

Variable Cost

Costs that vary directly with the level of production or service provision, increasing as production increases and decreasing as production decreases.

Fuel Payments

Money expended to cover the cost of fuel, often in the context of transportation, heating, or energy production.