The Loss of Mayflies from a Stream Suggests That the Quality

question 82

Multiple Choice

The loss of mayflies from a stream suggests that the quality of water is declining; therefore, mayflies are a(n) ____ species.​

• A) ​degraded
• B) ​endangered
• C) ​threatened
• D) ​keystone
• E) indicator​

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Definitions:

Instability

The state of being prone to change or failure; lacking firmness or steadiness in social, emotional, or physical realms.

Impulses

Sudden, involuntary urges to act or do something, often without premeditation.

Suicide Rates

The number of suicides occurring in a particular population over a specified period of time.

Ethnic Groups

Communities or populations sharing a common culture, ancestry, language, history, and often geographic region.