You are presented with the quiz "How do leaves keep animals from getting cold? " But you don't know the answer, so you turn to your teacher to ask for hints. He says that "preventing the transfer of heat from an organims 's body causes that organism to keep warm" and "leaves can keep animals warm". So, what's the best answer to the question?

OPTIONS:
-can be worn as clothes;
-protect them;
-adapt to coolness;
-heat with the sun;
-used to start fires;
-hard outer covering;
-preventing heat transfer;
-A transportation fuel;
The answer is:
preventing heat transfer