What is the causative agent of q fever?
coxiella burnetii
chlamydophila psittaci
mycoplasma pneumoniae
streptococcus pyogenes

Coxiella burnetii

Explanation:

Q fever is an infectious disease caused by Coxiella burnetii. Coxiella burnetii is a bacterium that affects both humans and other animals. Q fever is spread to human through animals like sheep, cows etc. Q fever is a disease ( mild disease) with flu like symptoms includes cough, fever, nausea etc.

Coxiella burnetii commonly found in goat, sheep and cattle its also including pets like dogs and cats. These animals transmit the bacteria through the urine, milk etc. when these substances dry , the bacteria floats in the air so the infection is transmit through the lungs when we inhale contaminated air.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).