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.

Fact: Worms such as the familiar earthworm are segmented. 
Question: Worms such as the familiar earthworm are what?
segmented.

Fact: incinerated mercury can cause the ph of soil to decrease. 
Question: what can cause the ph of soil to decrease?
incinerated mercury.

Fact: to estimate the age of a forest, find the tree with the highest number of rings. 
Question: Estimating the rings on a tree tells you what?

Age of the forest.