Answer :
Final answer:
Pathogenicity refers to the a) ability of organisms to cause infection. Highly virulent pathogens are more likely to cause severe illness, while less virulent pathogens may result in milder symptoms. Pathogens can be classified as primary or opportunistic.
Explanation:
Pathogenicity refers to the ability of organisms to cause infection. It is the characteristic that allows microorganisms to successfully colonize a host and lead to the development of a disease. Highly virulent pathogens are more likely to cause severe illness, while less virulent pathogens may result in milder symptoms. Pathogens that can cause disease in a host regardless of the host's defenses are called primary pathogens, while opportunistic pathogens can only cause disease in certain situations.
Learn more about pathogenicity here:
https://brainly.com/question/30591454
#SPJ11