A Polio-Free U.S. Thanks to Vaccine Efforts. ... Polio has been eliminated from the United States thanks to widespread polio vaccination in this country. This means that there is no year-round transmission of polio virus in the United States. Since 1979, no cases of polio have originated in the United States.
Answer:
A patient who can produce antibodies against some bacterial pathogens, but not against viral infections, probably has a disorder in his, B cells.
a) B cells
Answer:
E. Feedback
Explanation:
Feedback entails when an output of a system is used as an input to effect a cause or change usually to bring about improvement.
Corey was tracking the progress on the project and using the result to cause a chain of improvement.
Answer:
I would tell their parents (hopefully they are good parents), but I would tell them to act as if they figured it out by themselves, so my friend won't know that I told them and won't hate me.
