Refer to the Graph, Which Models the Theory of Island

question 185

Multiple Choice

Refer to the graph, which models the theory of island biogeography. The intersection points of the immigration and extinction curves on the graph represent points where, for that type of island,

• A) immigration is overtaking extinction, and the species number is rising.
• B) immigration and extinction are balanced, and the species number is in equilibrium.
• C) immigration and extinction are balanced, and the species number can no longer change.
• D) extinction is rising while immigration is declining, and the species number is declining.
• E) extinction will begin to rise more rapidly on distant islands, while slowing on nearby islands.

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Definitions:

APS

Average Propensity to Save (APS) is the ratio of total savings to total disposable income, indicating the portion of income that households save rather than spend.

Total Saving

The total amount of income saved by individuals, businesses, and the government, not spent on current consumption.

Disposable Income

The amount of income left for an individual or household after paying all taxes, available for spending, saving, or investing.

Autonomous Consumption

The level of consumption that occurs when income is zero, showing the basic level of consumption necessary for survival.