Why Do Skates and Rays Have Flattened Bodies, While Sharks

question 36

Multiple Choice

Why do skates and rays have flattened bodies, while sharks are torpedo-shaped?

• A) Sharks are more closely related to the tube-like lampreys than are skates and rays.
• B) Skates and rays need enlarged pectoral fins to help them stay level in turbulent water, while sharks do not.
• C) Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio, while sharks use gills to respire.
• D) Sharks are streamlined for active swimming at mid-depths, while skates move about mostly on the ocean floor.

Understand the use of visual patterns in document design for organizing information.

Grasp the principles of accessible web design.

Identify design principles crucial for creating effective navigational aids.

Understand the practices for conveying hierarchy within a document through design.

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Definitions:

Consumer Goods

Items produced for direct consumption by the end consumer.

Production Possibilities Curve

An illustrative chart that depicts the optimal mix of two goods or services that can be produced by an economy when it fully and efficiently employs all available resources.

Society's Production

The total output of goods and services produced by all sectors within a society or economy.

Capital Goods

Long-term assets such as machinery, buildings, and equipment purchased by companies to produce goods and services.