A living organism, such as a mosquito, that transfers a pathogen from one host to another is a(n) .

The correct term for a living organism, such as a mosquito, that transfers a pathogen from one host to another is a "vector." Vectors are often insects or arthropods that can carry and transmit diseases or parasites, playing a crucial role in the life cycle and spread of infectious diseases. Mosquitoes, for instance, can transmit various pathogens, including those causing diseases like malaria, dengue fever, and Zika virus.

Vectors do not cause the disease themselves; instead, they facilitate the transmission of pathogens between hosts. Understanding the role of vectors is essential in epidemiology and vector control strategies aimed at preventing the spread of infectious diseases. This knowledge helps in formulating public health responses, such as controlling mosquito populations or implementing vaccination programs to reduce the incidence of diseases they can transmit.