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: burning wood is used to produce heat.
answer:
burning wood trees.


question:
Fact: Insects generally have two pairs of wings for flight.
answer:
dragonflies are insects.


question:
Fact: Echinoderms use pheromones to communicate with each other.
answer:

Echinoderms starfish.