How Do Ecological Communities Change Over Time

question 61

Multiple Choice

How do ecological communities change over time?

• A) Interactions between and among species may cause changes in ecological communities over time.
• B) Keystone species typically become the most common species within an ecological community.
• C) Species richness typically declines as one species outcompetes all other species.
• D) Ecological communities are defined at a given point in time; any change leads to reclassification of the community.

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Definitions:

Occupational Diseases

Illnesses resulting from the conditions or environment of a particular occupation.

Workers' Compensation System

A form of insurance providing wage replacement and medical benefits to employees injured in the course of employment in exchange for mandatory relinquishment of the employee's right to sue their employer.

Employee Polygraph Protection Act

A federal law that prohibits most private employers from using lie detector tests, either for pre-employment screening or during the course of employment.

Lie Detector Test

A psychological examination that measures physiological responses to determine the truthfulness of an individual's statements, commonly known as a polygraph test.