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: An item's weight causes its gravitational force. 
Question: The weight of an item causes its what?
gravitational weight.

Fact: Heat energy makes digestion easier. 
Question: What does heat energy do?
makes digestion easier.

Fact: lactobacillus is present where absorption of nutrients occurs. 
Question: What is present where the absorption of nutrients occurs?

lactobacillus.