Which sentence states a fact?
Bottlenose dolphins can stay underwater for up to fifteen minutes. Bottlenose dolphins are the cutest animals in the ocean.
A fact is something that can be proved to be true.
The month of July has more days than the month of June.
This is a fact. It can be proved by looking at a calendar and counting the number of days in each month.
An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true.
July is a better month than June for camping.
This is an opinion. People may have different opinions about which month is "better" for camping.
The first sentence states a fact.
Bottlenose dolphins can stay underwater for up to fifteen minutes.
It can be proved by observing bottlenose dolphins.
The second sentence states an opinion.
Bottlenose dolphins are the cutest animals in the ocean.
Cutest shows what a person believes, thinks, or feels. Another person might have a different opinion about what the cutest animals are.