The Following Questions Refer to the Paragraph Below

question 4

Multiple Choice

The following questions refer to the paragraph below.
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 1. gills.
2) spiracles.
3) tracheae.

• A)1 only
• B)3 only
• C)1 and 3
• D)2 and 3
• E)1, 2, and 3

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Definitions:

Profit-Maximizing

This refers to the process businesses use to determine the output level at which profits are at their highest.

Marginal Revenue Curve

A graph that displays how additional revenue is affected by the sale of one more unit of a product or service.

Downsloping

describes a trend or curve that goes downward, often used in economics to describe demand curves where price decreases lead to an increase in quantity demanded.

Economic Profits

Profits exceeding the opportunity costs of a venture or investment, accounting for both explicit and implicit costs.