It is narrated by a character in the story
One way to figure out the meaning of an unfamiliar word is to know how it is used in the sentence it is part of. If you understand the context of the sentence then its meaning can be inferred from the sentence usage.
It is also better to look it up in the dictionary to further know the meaning of the word, its etymology, and usage. This is to support your initial understanding of the unfamiliar word as part of the sentence you have read.
The correct answer is B - the writer's identity.
Imagine if you received a letter, and you start reading it, but you have no idea who is it from! It would be confusing. The day, who you are, and your information will be located at the top of the letter, then include the name and information of the person receiving, in the same format.
Example:
(Insert your name)
123 ABC St.
New York City, NY 99999
April 1st, 2017
Dr. Patricia Brown
777 West Ave.
Los Angeles, CA 111111
Dear, Dr. Patricia Brown,
(Purpose for writing goes here)
(An expression of thanks)
Sincerely,
(Insert your name)
Virus is actually just a piece or strand of genetic information usually DNA or RNA which can be single or double stranded.
Viruses are everywhere from our surroundings to the very food we eat. We ingest, inhale and talk in millions of viruses every second. Pretty much all life on Earth has some kind of virus designed specifically to infect in including bacteria and even other viruses. Viruses are tiny very tiny you can visibly see them if fact they are so small that if bacteria had eyes even they wouldn't be able to see all of them.