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: loud noises can cause animals to startle.
[A]: animals mammal.


[Q]: Fact: Pedigrees are useful tools for studying inheritance patterns.
[A]: inheritance animals.


[Q]: Fact: Secondary growth forms secondary vascular tissues and bark.
[A]:
Secondary growth tree.