Please choose the answer that best completes the blanks of this sentence in the correct order. is the ability of a microbe to cause disease, whereas refers to the relative severity of a disease caused by a particular microorganism.

The given blanks can be filled with pathogenicity and virulence.

Explanation:

The tendency of an organism or a microbe to harm the host, which eventually results in disease is termed as pathogenicity. The concept of pathogenicity signifies the genetic constituent of the pathogen and the destruction resulting in the host because of the association between the host and the pathogen like a microbe.  

While the extent to which a pathogen or a microbe causes pathogenicity to the host is termed as virulence. The degree of virulence is generally associated with the tendency of the microbe to proliferate within the host.  

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?