Read this passage from "The Tell-Tale Heart": I thought the heart must burst. And now a new anxiety
seized me the sound would be heard by a neighbour!
The old man's hour had come! With a loud yell, I threw
open the lantern and leaped into the room. He shrieked
once – once only. In an instant I dragged him to the floor,
and pulled the heavy bed over him. I then smiled gaily, to
find the deed so far done. But, for many minutes, the heart
beat on with a muffled sound. This, however, did not vex
me; it would not be heard through the wall. At length it
ceased. The old man was dead.
Poe's use of both long and short sentences affects what structural element in
the passage?

can you say more details

eli whitney was an american inventor best known for inventing the cotton gin. this was one of the key inventions of the industrial revolution and shaped the economy of the antebellum south.

i would have to say "a" or "d".

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.