What are 2 questions about the living world

What is the Fastest fish?:    

Answer   >    Cosmopolitan Sailfish  <

  Swordfish  

  Shark  

  Bluefin Tuna  

  Eel

2):   Most contagious disease:  

  Tuberculosis  

  Malaria  

  Leprosy  

 Answer  >  Common cold  <

  AIDS

3): Smallest bird:

• Hummingbird

• Sparrow  

• Kingfisher  

• Kittiwake  

• Kiwi  

 > Hummingbird  <

Hope that helps            Hope this is what you are looking for:        : )

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.