Some Birds Follow Moving Swarms of Army Ants in the Tropics

question 34

Multiple Choice

Some birds follow moving swarms of army ants in the tropics. As the ants march along the forest floor hunting insects and small vertebrates, birds follow and pick off any insects or small vertebrates that fly or jump out of the way of the ants. What is the result of the association between birds and ants?

• A) Birds benefit from the association but have no impact on the ants.
• B) Birds benefit from the association and harm the ants.
• C) Birds and ants benefit from the association.
• D) Birds do not benefit from the association, but the ants do.
• E) Neither birds nor ants benefit from the association.

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Definitions:

Recession

A significant decline in economic activity across the economy, lasting more than a few months, typically visible in real GDP, real income, employment, industrial production, and wholesale-retail sales.

After-Tax Profit

The net income after all taxes have been deducted, reflecting the actual profitability of a company.

Recession

A period of temporary economic decline during which trade and industrial activity are reduced, typically recognized by a fall in GDP in two successive quarters.

Corporate Tax Rate

The proportion of a company's earnings that is remitted to the government in the form of taxes.