The right options are;
are disease-causing microorganisms
can be fatal
A pathogens is any substance or organism especially microorganisms that are capable of causing diseases. Pathogens include; bacteria, viruses, protozoa or fungi. Microorganisms are not considered to be pathogenic until they have reached a population size that is large enough to cause disease. Pathogens can be fatal and can be treated. Pathogens are diverse and they occupy essentially every environment.
Ans.
Pathogens can be defined as infectious agents that cause illness or diseases to their host organisms. Pathogens can be virus, bacteria, worms, fungi, or protozoa.
All pathogens have potential to cause disease and they can be fatal that cause life-threatening diseases, such as Ebola virus. Pathogens can be treated bu drugs or are eliminated by immune responses of host body.
Thus, the correct options are 'are disease-causing microorganisms', and 'can be fatal.'
