Which sentence states a fact?
Polar bears are generally cuter than black bears. Black bears are generally smaller than polar bears.
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 second sentence states a fact.
Black bears are generally smaller than polar bears.
It can be proved by comparing the sizes of black bears and polar bears.
The first sentence states an opinion.
Polar bears are generally cuter than black bears.
Cuter shows what a person believes, thinks, or feels. Another person might have a different opinion about what is cute.