Sea turtles are amazing creatures. - opinion: not everyone has the same viewpoint
Green sea turtles are herbivores that eat algae and sea grass - fact: has been observed in green sea turtles
Goldfish need lots of tank space and clean water for an optimal life - fact: has been proven through experiment
Goldfish are easy pets. - opinion: not everyone has the same viewpoint
More US households have dogs than cats. - fact: has been proven through statistic
Dogs are better than cats. - opinion: not everyone has the same viewpoint
Email is better than snail mail. - opinion: not everyone has the same viewpoint
Email has become more popular than traditional snail mail due to the age of the internet. - fact: has been proven through statistic and observation
Sleep deprivation causes people to be less alert and have trouble paying attention. - fact: has been proven through experiment and observation
I like to sleep. - opinion: not everyone has the same viewpoint
A statement is a fact if it is proven to be true through methods such as research. However, a statement is an opinion if not everyone has the same viewpoint on the topic.