Irony is definitely the answer to your question.
He was looked up more from the writers as an inspiration, it was the other way around. The inspiration to Poe 's darkest and most well known poem, written in 1845, was a real raven that was the beloved pet of the writer Charles Dickens who named it Grip.
The main idea of this paragraph is that, without cells, there would not be any organism. As it is said, according to biologists there are<u> five levels </u>of cell organization in organisms, which, working together as a colony, can form from tissue to a whole body system able to live by itself.