You are presented with the question "What cannot reproduce by themselves?" and the following answer choices: 
- fungi
 - insects
 - influenza
 - Leptospirosis
 - bacteria
 - ferns
 - mammals
 - acetic acid

Now knowing that viruses cannot reproduce by themselves and influenza Virus Influenza viruses make up the family Orthomyxoviridae, choose the best answer.


 

   influenza      