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

[Q]: Passage: The range is the total spread of values. It gives you an idea of the variation in the measurements. The range is calculated by subtracting the smallest value from the largest value. For the data in Table above , the range in numbers of vehicles by type is: 150 - 50 = 100. Answer: the range
[A]: What is calculated by subtracting the smallest value from the largest value?

[Q]: Passage: The Gaia hypothesis states that the biosphere is its own living organism. Answer: the gaia hypothesis
[A]: What hypothesis states that the biosphere is its own living organism

[Q]: 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
[A]:
What type of dating determines which of two fossils is older or younger than the other but not their age in years?