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

Example Input: Passage: Amphibians have permeable skin that easily absorbs substances from the environment. This may explain why they seem to be especially sensitive to pollution. Monitoring the health and survival of amphibians may help people detect pollution early, before other organisms are affected. Answer: amphibians
Example Output: What group of animals has permeable skin that makes them vulnerable to pollution?

Example Input: 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
Example Output: What type of dating determines which of two fossils is older or younger than the other but not their age in years?

Example Input: Passage: Food calories are determined by burning the food and measuring the heat released. Answer: calories
Example Output:
What property of food is determined by burning the food and measuring the heat released?