Zebra Mussels Were Introduced into Lake St

question 51

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

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Definitions:

Flood Basalts

Large-volume basaltic lava flows that cover vast areas.

Magma Chambers

Reservoirs beneath Earth's surface containing molten rock, crucial to the process of volcanic activity and the formation of igneous rocks.

Crystal Setting

The process or arrangement by which crystals are positioned or embedded within a piece of jewelry or a geological matrix.

Rock Walls

Natural or man-made vertical structures made of rock, often serving as boundaries, fortifications, or geological features.