Zebra Mussels Were Introduced into Lake St

question 24

Multiple Choice

Zebra mussels were introduced into Lake St. Clair around 1988. The table lists the population densities (in grams dry weight per square meter of lake bottom) of native unionid mussels and exotic zebra mussels in the lake before and after this introduction. Both groups feed by filtering small particles from the water. Based on the information given, which of the following best describes the likely relationship between zebra mussels and unionids?

• A) Zebra mussels exert a density-dependent control on unionid populations.
• B) Zebra mussels and unionids have no effect on each other.
• C) Unionids exert a density-independent control on zebra mussel populations.
• D) Unionids exert a density-dependent control on zebra mussel populations.
• E) Zebra mussels exert a density-independent control on unionid populations.

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Definitions:

Productive

Refers to the effectiveness and efficiency with which an individual or a system converts inputs into useful outputs.

Measurable Factors

Factors that can be quantified or measured directly, often used in analysis or research to assess impacts or outcomes.

Variation In Wages

The differences in pay received by employees due to factors like experience, education, and location.

Ability

The possession of the means or skill to do something; often considered in economic terms as related to productivity and employment.