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: pollen is made by haploid plants. 
Question: what makes pollen?
[A]: haploid plants.


[Q]: Fact: cows make nutritious fluid. 
Question: What do cows make?
[A]: nutritious fluid.


[Q]: Fact: Algae play significant roles as producers in water ecosystems. 
Question: Algae plays a significant role as producers in what kind of ecosystem?
[A]:
water.