Problem: Generate a sentence that contains a fact.
Sentence: coloration is used to find a mate by some animals

Problem: Generate a sentence that contains a fact.
Sentence: An example of navigation is directing a boat

Problem: Generate a sentence that contains a fact.
Sentence: water flows down a slope

Problem: Generate a sentence that contains a fact.
Sentence:
if two animals have the same food source then those two animals compete for food