instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Relative dating determines which of two fossils is older or younger than the other but not their age in years. Relative dating is based on the positions of fossils in rock layers. Lower rock layers were laid down earlier, so they are assumed to contain older fossils. This is illustrated in Figure below . Answer: relative
answer:
What type of dating determines which of two fossils is older or younger than the other but not their age in years?

question:
Passage: Producers are living things that use energy to make food. Producers make food for themselves and other living things. There are two types of producers:. Answer: producers
answer:
Living things that use energy to make food, both for themselves and other living things, are what part of an ecosystem?

question:
Passage: Cell division is just one of the stages that all cells go through during their life. This includes cells that are harmful, such as cancer cells. Cancer cells divide more often than normal cells, and grow out of control. In fact, this is how cancer cells cause illness. In these concepts, you will read about how cells divide, what other stages cells go through, and what causes cancer cells to divide out of control and harm the body. Answer: cell division
answer:
All cells undergo what during a lifetime, but when this process is out of control, cancer results?