Doctors recommend that most people get a yearly influenza vaccine because a previous year's vaccine is usually not effective for the current flu season. Which of these statements explains why influenza vaccines are generally not effective from one year to the next?
OA.
Influenza viruses mutate rapidly as they reproduce.
OB.
Influenza viruses do not respond to vaccines.
Ос.
Influenza viruses cannot survive outside the human body.
OD. Influenza viruses can be transmitted through the air.

Type the corect answer in the box.there were many causes of the enlightenment. however, a particular revolution played an important role in its development. this revolution was a result of discoveries made by scientists such as isaac newton and galileo galilei. they dug deep into the realms of science to discover new laws of physics and decipher the mysteries of the universe. the revolution refuted the claims of the catholic church about the position of earth in the solar system.this revolution is called what?