1-The fastest land dwelling creature is the Cheetah.
Fact. This is fact because it can be verified.
2-the ugliest sea creature is the manatee.
Opinion. Because opinions vary and beauty (or ugliness) is relative, perspectives on what is considered “ugly” will vary.
3-prison is one of the worst places on the planet.
Opinion. This is a relative thought. To some, prison might be considered a good place. In fact, there are instances where convicts cannot function in society after a long prison term and commit crimes to be returned to prison because society has become a bad place—a place where hardships outweigh those they faced in prison.
4-Oranges contain both calcium and vitamin C.
Fact. This is something that can be tested and verified as true.
NOTE: When trying to determine whether something is a fact or an opinion, just be sure to keep in mind that if the statement can be proven, it is fact; if the statement cannot be proven, it must be an opinion.