Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: Describe and explain volcanic activity that occurs within oceanic and continental plates. Answer: convergent boundary

Ex Output:
What is the tectonic zone called where two plates come together?

Ex Input:
Passage: You consist of a great many cells, but like all other organisms, you started life as a single cell. How did you develop from a single cell into an organism with trillions of cells? The answer is cell division. After cells grow to their maximum size, they divide into two new cells. These new cells are small at first, but they grow quickly and eventually divide and produce more new cells. This process keeps repeating in a continuous cycle. Answer: cell division

Ex Output:
What process allows an individual to develop from a single cell into an organism with trillions of cells?

Ex Input:
Passage: Bears get their energy from their food. Brown bears eat a varied diet, from nuts and berries to fish and other animals. When bears eat a berry, they are obtaining energy that the plant originally captured from the sun. Even when a bear eats another animal, the energy in that animal ultimately came from eating a producer that captured the sun's energy. Answer: sun

Ex Output:
Which is the ultimate energy source in a bear's food chain?