Problem: Generate a sentence that contains a fact.
Sentence: a line graph is used for showing change over time

Problem: Generate a sentence that contains a fact.
Sentence: natural gas is a source of heat by burning

Problem: Generate a sentence that contains a fact.
Sentence: a thermal energy conductor transfers heat from hotter objects to cooler objects

Problem: Generate a sentence that contains a fact.
Sentence:
ecological succession means entire communities in an ecosystem change over time