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: most animals consume and are consumed by more than one species. 
Question: what consume and are consumed by more than one species?

Answer: animals.


Question: Fact: Invertebrates are animals that lack a support column. 
Question: Invertebrates are animals that lack a what?

Answer: support column.


Question: Fact: when ice causes rocks to crack by expanding in openings, this is known as mechanical weathering. 
Question: When ice causes rocks to crack by expanding in openings, what is this called?

Answer:
mechanical weathering.