Add or Subtract. Simplify the Answer

question 17

Multiple Choice

Add or subtract. Simplify the answer.
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Definitions:

Virulent

Describes a pathogen or microbe that is highly infectious, dangerous, or capable of causing severe disease.

Transmission

The act or process of transferring something from one place, person, or thing to another, often used in the context of diseases, information, or genetic traits.

Parasites/pathogens

Organisms that live on or in a host organism and cause harm or disease to the host.

Endogenous Retroviruses

Viral sequences in the genome that result from ancient viral infections in the lineage of a species, now transmitted vertically from parent to offspring.