Q: You are presented with the quiz "What derive energy from the breakdown of organic molecules?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "all animals are heterotrophs" and "heterotrophic bacteria derive energy from the breakdown of organic molecules". So, what's the best answer to the question?

Select from: * Most plants; * hydrocarbons; * potatoes; * all stones; * all water sources; * all mountains; * all animals; * Generating heat;
A:
all animals