Examlex
The _______ system is most active during periods of calm and physical rest.
Abundance
The great quantity or amount of something in a given area or volume.
Pathogens
Microorganisms or agents that can cause disease, including viruses, bacteria, fungi, and parasites.
Pandemic
A widespread epidemic that covers a large geographical region and infects a significantly large portion of the people.
Viral Evolution
The process by which virus populations and their genetic structures change over time due to mutations, recombination, and selection pressures.
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