Some Aquatic Invertebrates Such as Insects and Snails Feed on Biofilms

question 59

Multiple Choice

Some aquatic invertebrates such as insects and snails feed on biofilms. Scientists that study metal-contaminated streams have documented that some biofilms in stream environments absorb zinc from stream water during daylight hours and release the zinc into the stream during the night. What might the scientists hypothesize about zinc concentration in the stream?

• A)The highest zinc concentrations in stream water might occur only during the day.
• B)The highest zinc concentrations in stream water might occur only at night.
• C)Zinc concentrations in stream water are likely to be similar during the day and at night.

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Definitions:

Y-Intercept

The point at which a line crosses the y-axis of a graph, representing the value of the dependent variable when all independent variables are zero.

Torque

A rotational force applied to an object, calculated as the product of the force and the distance from the point of application to the axis of rotation.

Displacement

In physics, the change in position of an object; in engineering, the volume swept by the pistons inside the cylinders of an engine.

Horsepower

A unit of measurement for power, traditionally used to quantify the output of engines or motors.