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


question:
Fact: Origami causes an object to change shape. 
Question: What is a method for changing an object's shape?
answer:
origami.


question:
Fact: ova and spermatozoa unite in fertilization and form a diploid zygote. 
Question: what are united in fertilization for form a diploid zygote?
answer:

ova and spermatozoa.