Use the Following Information to Answer the Question

question 58

Multiple Choice

Use the following information to answer the question.
A farm pond, usually dry during winter, has plenty of water and aquatic pond life during the summer. One summer, Sarah returns to the family farm from college. Observing the pond, she is fascinated by some six-legged organisms that can crawl about on submerged surfaces or, when disturbed, seemingly "jet" through the water. Watching further, she is able to conclude that the "mystery organisms" are ambush predators, and their prey includes everything from insects to small fish and tadpoles.
Sarah observed that the mystery pond organisms never come up to the pond's surface. If she catches one of these organisms and observes closely, perhaps dissecting the organism, she should find ________.

• A) gills
• B) spiracles
• C) tracheae
• D) book lungs

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Definitions:

Net Exports

The value of a country's total exports minus its total imports, measuring the net trade of goods and services with other economies.

Nominal Exchange Rate

The rate at which one country's currency can be traded for another country's currency.

Yuan

The currency unit of the People's Republic of China, often used to denote the basic monetary unit.

Real Exchange Rate

The real exchange rate is an economic measure that compares the relative price of domestic goods to foreign goods, adjusted for currency exchange rates.