The Following Questions Refer to the Evolutionary Tree in Figure

question 39

Multiple Choice

The following questions refer to the evolutionary tree in Figure 22.2.
The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

Figure 22.2
-Which of the five common ancestors, labeled V-Z, has been least successful in terms of the percent of its derived species that are extant?

• A) V
• B) W
• C) X
• D) Y
• E) Z

---

Definitions:

Consumer Market

A marketplace for goods and services that are purchased for personal, family, or household use.

Manufacturing Base

The sector of an economy that is involved in the production of goods in large quantities, utilizing labor and machines.

Trade Deficit

An economic measure where a country's importation of goods exceeds its exportation, reflecting a net outflow of domestic currency to foreign markets.

Merchandise Balance

The difference in value between a nation's imports and exports of tangible goods.