The Fossil Record Shows That the Jawed Fishes Called ____

question 90

Multiple Choice

The fossil record shows that the jawed fishes called ____, which diversified in the Devonian and Carboniferous periods but left no direct descendants, had heads covered with large, heavy, bony plates and jaws with sharp cutting edges.

• A) acanthodians
• B) conodonts
• C) osteolepiforms
• D) placoderms
• E) ostracoderms

---

Definitions:

Industry Equilibrium

A state where industry supply equals demand, leading to stability in prices and quantities produced and consumed.

Economic Profits

The difference between total revenue and total costs, including both explicit and implicit costs, indicating a firm's surplus beyond the normal profit level.

Price-Searcher Market

A market structure where sellers have the ability to control or influence prices due to a lack of perfect competition.

Fast Food Market

The sector of the food service industry that specializes in food that can be prepared and served quickly.