Answer :
Final answer:
In arthropod vectors, when a pathogen is transferred from one developmental stage to another it is referred to as transstadial transmission.
Explanation:
Transstadial transmission is the term used when a pathogen is transferred from one developmental stage of an arthropod vector to another, as part of biological transmission. This is a form of biological transmission where the pathogen reproduces within a biological vector that transmits the pathogen from one host to another.
For example, ticks may carry a pathogen during one developmental stage and then transmit it to a new host at another stage. Biological transmission is distinct from mechanical transmission, where an arthropod carries a pathogen from one host to another without the pathogen reproducing within the vector.