When an Infectious Disease Cannot Spread in a Population Because

question 43

Multiple Choice

When an infectious disease cannot spread in a population because it lacks a significant number of susceptible hosts, the phenomenon is referred to as

• A) protected population.
• B) active immunity.
• C) passive immunity.
• D) herd immunity.
• E) protective immunity.

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Definitions:

Natural Selection

A fundamental mechanism of evolution where organisms with traits better suited to their environment are more likely to survive and reproduce, passing those traits to the next generation.

Mutation

A change in the DNA sequence within a gene or chromosome of an organism that can result in a different trait or characteristic.

Evolutionary Change

The pathway through which multiple categories of living beings are believed to have advanced and diversified from primitive forms during the chronological history of Earth.

Fully Aquatic

Pertains to organisms that spend their entire life cycle living in water.