Final answer:
Communicable diseases are best described as infectious diseases caused by pathogens that can be transmitted from one person to another.
Step-by-step explanation:
a. Infectious
Communicable diseases are best described as infectious diseases. These are diseases that are caused by pathogens such as bacteria, viruses, and parasites, which can be transmitted from one person to another. Examples of communicable diseases include common cold, flu, tuberculosis, and COVID-19.
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