Which is the most common type of biological vector of human disease?
viruses
bacteria
mammals
arthropods

arthropods

Explanation:

Biological vector is the organisms which transfer disease causing microbes (pathogen) from one host to another. Arthropods are the most common type of vectors responsible for human diseases. Arthropod vectors include mosquitoes, which transmit malarial parasite, lice transmits typhus pathogen. Other arthropod vectors can include ticks that transmits Lyme disease, tsetse fly transmits pathogen of African sleeping sickness, and sand fly transmits pathogen leishmaniasis.

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