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.

[Q]: Fact: travelling requires navigation.
[A]: Maps are very useful in navigating through challenging terrain.


[Q]: Fact: staying warm has a positive impact on an animal 's survival.
[A]: animal survival.


[Q]: Fact: Most invertebrates have a nervous system.
[A]:
invertebrate.