Final answer:
A biological vector is a vector that transmits pathogens and also serves as a host for a part of the pathogen's life cycle.
Step-by-step explanation:
A vector that transmits pathogens and also serves as host for a part of the pathogen's life cycle is called a biological vector. Biological transmission occurs when the pathogen grows and reproduces inside the vector animal. This type of vector carries and transmits the pathogen between hosts, facilitating the spread of diseases. A vector that transmits pathogens and also serves as host for a part of the pathogen's life cycle is a biological vector. This type of transmission involves the growth and reproduction of the pathogen within the vector itself before it is transmitted to the next host. Common examples of biological vectors include mosquitoes and ticks, which are well-known for spreading diseases such as Malaria, Lyme disease, and West Nile virus. Unlike mechanical vectors, which merely transfer pathogens without them growing or reproducing within the vector, biological vectors are integral to the life cycle of the pathogen.