instruction:
In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.
question:
Fact: Mollusks reproduce sexually.
answer:
Mollusks.


question:
Fact: the Earth revolving around the Sun causes the seasons to change on its axis.
answer:
earth axis.


question:
Fact: when a cooler object touches a warmer object , thermal conduction occurs.
answer:

conduction heat.