Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: This tiny plant can use the energy of the sun to make its own food. You can't make food by just sitting in the sun. Plants are not the only organisms that can get energy from the sun, however. Some protists, such as algae, and some bacteria can also use the energy of the sun to make their own food. Answer: plants
A:
What is the main type of organism that gets its energy directly from the sun?