When You Observe a Lake That Has Been Affected by Acid

question 67

Multiple Choice

When you observe a lake that has been affected by acid deposition, you might expect to find

• A) excess carbon that will contribute to global warming.
• B) low levels of toxic metals and nutrients essential for the growth of biotic organisms.
• C) a clear lake with high levels of aluminum, mercury, and lead, but few fish.
• D) high levels of dissolved sulfur dioxide.
• E) a murky lake with excess algal growth from the deposition of anthropogenic nitrogen.

---

Definitions:

Nocturnal

Describing organisms that are active primarily during the night and sleep during the day.

Diurnal

Describing organisms active during the day and resting at night; also pertains to daily cycles of light and darkness.

Biological Clocks

Biological clocks are internal mechanisms in organisms that regulate cycles of activity and rest, including sleep-wake cycles and hormonal changes, in accordance with environmental changes.

Environmental Cues

Signals from the environment that can affect the behavior and physiology of organisms.