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For a specific element, photons of how many different energies could be emitted by electrons in the n = 2 level as they return to the n = 1 level?
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.
Pathogens
Agents, usually microorganisms such as bacteria, viruses, or fungi, that cause disease in their host organisms.
Antibiotic Resistance
A phenomenon where bacteria evolve and become resistant to the effects of antibiotics, rendering treatments less effective.
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