The Earth is the only planet in our solar system known to support life.
Fact. (This is a verifiable statement based on current scientific knowledge. The key word is "known".)
Learning a second language is easier for children than it is for adults.
Fact. (While "easier" can be subjective, this is a widely supported finding in linguistics and neuroscience, related to brain plasticity. It's a provable trend.
By 2050, solar power will be the most efficient energy source available.
Opinion. (This is a prediction about the future. It cannot be verified as true or false right now.)
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