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: Gymnosperms are vascular plants that produce seeds in cones.
answer:
Gymnosperms.


question:
Fact: transpiration is when water vapor moves from plants into the atmosphere.
answer:
atmosphere air.


question:
Fact: Echinoderms lack a centralized nervous system.
answer:

Echinoderms sand dollar.