Joseph Connell Discovered That Balanus Barnacles Were Excluded from the Upper

question 33

Multiple Choice

Joseph Connell discovered that Balanus barnacles were excluded from the upper intertidal zone by ________, while Chthalamus barnacles were excluded from the middle intertidal zone by ________.

• A) competition from mussels; prolonged immersion in water
• B) competition from mussels; competition with Balanus
• C) prolonged exposure to air; competition with Balanus
• D) prolonged exposure to air; competition with algae
• E) predation by wading birds; predation by starfish

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Definitions:

Demand for Goods

The desire, willingness, and ability of consumers to purchase goods at a given price over a specific time period.

Unemployment Insurance

A government program that partially protects workers’ incomes when they become unemployed.

Multiplier

The factor by which an initial change in spending will alter total economic output, usually in the context of fiscal or monetary policy.

MPC

Marginal Propensity to Consume, which is the proportion of additional income that a consumer spends on goods and services as opposed to saving it.