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: Roundworms make up the phylum Nematoda.
answer:
Nematoda.


question:
Fact: Amphibians have a relatively complex circulatory system with a three-chambered heart.
answer:
amphibian frog.


question:
Fact: creating paper requires cutting down trees.
answer:

cutting down trees causes harm to environment.