Which sentence states a fact?
Preserving dead people as mummies is definitely gross. In ancient Egypt, some people were preserved as mummies after they died.
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.
In ancient Egypt, some people were preserved as mummies after they died.
It can be proved by reading a book about ancient Egypt.
The first sentence states an opinion.
Preserving dead people as mummies is definitely gross.
Definitely gross shows what a person believes, thinks, or feels. Another person might have a different opinion about what is gross.