Source #1
1: "If people do not stop harvesting so many octopi from the ocean, they might become extinct," said Dr. Paul Cephal.
2: "Octopi may be endangered creatures."
Source #2:
1: "Octopi are definitely highly intelligent creatures."
2: "Octopi are very secretive"
3: "According to biological classification, octopi are cephalopod mollusks."
4: "Octopi inhabit coral reefs, which are endangered."
From source #1, the first sentence is an example of a(n) _____.
