My best guess is C not sure tho
B. tears , this is not a first line of defense
Biological transmission involves reproduction of pathogens in an arthropod vector prior to transmission. In terms of epidemiology, we can term a vector as an organism that is from infected to the uninfected. An infected organism which develops biological vector passes it to its host. For example a mosquito.
A mosquito being a mechanical vector carries an infected organism to its host either through the legs or through the other body parts
Answer:
All the above D
Explanation: all of them are true!
3rd option im pretty sure. Sorry if its incorrect
