Darters Are Fish That Live in Fast-Running Rapids;they Eat Surface

question 53

Multiple Choice

Darters are fish that live in fast-running rapids;they eat surface insects,they rest on the bottom avoiding the push of the water,and make brief frantic dashes to the surface to feed.If they swam midstream,they would expend a huge amount of energy.What physiological strategy allows them to live on the bottom?

• A)Lack of gills
• B)Loss of a lateral-line
• C)Loss of a swim bladder
• D)Reduction in fin size and number
• E)Expansion of a swim bladder into a lung

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Definitions:

Steamboat

A boat that is propelled by a steam engine, instrumental in the 19th-century development of the American river transportation system.

Commercial Launch

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1807

The year notable for the passage of the Act Prohibiting Importation of Slaves in the United States, marking a significant step toward the abolition of slavery.

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