In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[EX Q]: Question: When gas particles collide, what kinds of collisions are these considered? Answer: elastic
[EX A]: When gas particles collide, these collisions are considered elastic.

[EX Q]: Question: Producing light without heat is called what? Answer: luminescence
[EX A]: Producing light without heat is called luminescence.

[EX Q]: Question: What ensures that seeds germinate only when conditions for seedling survival are optimal? Answer: seed dormancy
[EX A]:
Seed dormancy ensures that seeds germinate only when conditions for seedling survival are optimal.