Based on the given sentences above, the one that is punctuated correctly is the second sentence: She sends an email therefore, to her instructor and advisor. What makes the first sentence incorrect is that, it has no period at the end of the sentence. Hope this answer helps.
Metaphor ...................
D. where did the poet live around the time the poem was written
The Hindenburg disaster at Lakehurst, New Jersey on May 6, 1937 brought an end to the age of the rigid airship.
The disaster killed 35 persons on the airship, and one member of the ground crew, but miraculously 62 of the 97 passengers and crew survived.
After more than 30 years of passenger travel on commercial zeppelins — in which tens of thousands of passengers flew over a million miles, on more than 2,000 flights, without a single injury — the era of the passenger airship came to an end in a few fiery minutes.
Gravity is a natural phenomenon
or
Mirages are a common desert phenomenon
Each time a new social media app is revealed to the world it becomes a phenomenon for a while and then slowly fades into unimportance
