Question

question 28 (1 point) which class of proteobacteria includes rickettsia, the causative agent of rocky mountain spotted fever gamma - proteobacteria beta - proteobacteria alpha - proteobacteria delta - proteobacteria question 29 (1 point) proof that a microbe could cause disease was provided by wasserman pasteur koch lister semmelweis

Explanation:

For Question 28, Rickettsia belongs to the class Alpha - proteobacteria among Proteobacteria. For Question 29, Robert Koch provided proof that a microbe could cause disease through Koch's postulates.

Answer:

Question 28: C. Alpha - proteobacteria
Question 29: C. Koch