Every year, a new influenza vaccine is developed. what is the most likely reason that doctors do not use the same vaccine each year? a. the vaccine turns into a new virus that causes a recurrence of the same influenza each year. b. the virus which causes influenza adapts each year to the last vaccine in order to survive and reproduce. c. any vaccine can only last for a year before it dies. d. a new, different virus that causes influenza enters the food chain through plants about once every year, infecting humans.

Every year, a new influenza vaccine is developed. What is the most likely reason that doctors do not use the same vaccine each year?

Answer : d.) a new, different virus that causes influenza enters the food chain through plants about once every year, infecting humans.

Hope this helps!

answer; i believe the correct answer is (data); /// good luck

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.