Top Posters
Since Sunday
G
4
K
3
o
3
3
m
2
c
2
r
2
p
2
s
2
s
2
b
2
c
2
Home Q & A Board Biology-Related Homework Help General Biology
New Topic  
tyressjones tyressjones
wrote...
Go to Answer
Posts: 4034
Rep: 6 0
7 years ago
Why are new flu shots necessary every year?
A) The flu is caused by either bacteria or viruses, depending on the year.
B) The shots do not result in the production of memory cells.
C) Flu viruses mutate rapidly.
D) The antiviral chemicals in flu shots last only 11 months.
Textbook 
Biology: Life on Earth

Biology: Life on Earth


Edition: 10th
Authors:
Read 69 times
2 Replies
Replies
Answer verified by a subject expert
kont24kont24
wrote...
#1
Top Poster
Posts: 1328
Rep: 25 0
7 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here
1

Related Topics

tyressjones Author
wrote...
#2
7 years ago
Person Raising Both Hands in Celebration
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1106 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 1211
  
 470
  
 119