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: Food can be cooked on metal. 
Question: Which surface can food be cooked on?
Metal.

Fact: Sponges trap and digest food with specialized cells. 
Question: What do sponges use to collect and digest food?
specialized cells.

Fact: If something with a kernel sticks to the fur of an animal then it will be transported by the animal. 
Question: Something with what sticks to the fur of an animal and is transported?

A kernel.