Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

[Q]: Fact: oxygen is essential for cellular respiration for fungi. 
Question: what requires oxygen for cellular respiration?
[A]: fungi.


[Q]: Fact: Passenger pigeons could not produce enough offspring. 
Question: What could not produce enough offspring?
[A]: passenger pigeons.


[Q]: Fact: most plants have a primary and secondary meristem. 
Question: What has a primary and secondary meristem?
[A]:
plants.