Why did vaccine makers have to guess which flu strains will be active months before the flu season begins?

Identify an example of an epic simile in book 13, book 21, or book 24 of the odyssey and explain how it is different from a typical simile.

Can someone “think of a time you overcame a challenge or obstacle. describe the experience in two or three sentences”

What textual evidence in “all the lovely stars” indicates that christina regretted her initial response to her mother’s plan togo to arizona for spring break? a.)christina builds a miniature desert in an old aquarium for mother. b.)christina squeezed her mother’s hand when she got home from school. c.)christina was worried when she learned that her mother’s ankle was broken. d.)christina knows her mother is concerned about her well-being while she is at the hospital.