Title: Host–parasite coevolution
Passage: Host--parasite coevolution is a special case of coevolution, which is defined as the reciprocal adaptive genetic change of two antagonists (e.g. different species or genes) through reciprocal selective pressures. In the particular case of host--parasite coevolution the antagonists are different species of host and parasite.
Question: can a parasite influence the evolution of its host
Answer: yes