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.
--------
Question: Fact: animals with calcite shells form large colonies in shallow tropical water. 
Question: Animals with _ form large colonies in shallow tropical water?

Answer: calcite shells.


Question: Fact: Machines can cause objects to change shape. 
Question: What can cause objects to change shape?

Answer: Machines.


Question: Fact: if preserved remains of an animal  are found in a place then that animal used to live in that place. 
Question: If _ of an animal are found in a place then that animal used to live in that place?

Answer:
preserved remains.