Problem: Generate a sentence that contains a fact.
Sentence: condensing causes a liquid to form
Problem: Randomly generate a fact.

Random fact: a ruler is used for measuring the length of an object
Generate a sentence that answers this question: "What is essential for a robot to possess to walk up a flight of stairs?".

Answer: a computer controls a robot
question: What sentence would provide a factual answer to this question: "How do some octopus hide?"

answer: ink is used for hiding from predators by octopuses
Problem: What is a random fact?

Answer: ferrous metals contain iron
Problem: Generate a sentence that contains a fact.
Sentence:
as population of predators decreases , the population of prey will increase in an environment