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

Ex 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

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

Ex Input:
Passage: Pollination by Insects Bees are perhaps the most important pollinator of many garden plants and most commercial fruit trees (Figure 32.12). The most common species of bees are bumblebees and honeybees. Since bees cannot see the color red, bee-pollinated flowers usually have shades of blue, yellow, or other colors. Bees collect energy-rich pollen or nectar for their survival and energy. Answer: pollination

Ex Output:
What important function do bees perform on garden plants and many commercial fruit trees?

Ex Input:
Passage: The oxygen enters the bloodstream from the alveoli , tiny sacs in the lungs where gas exchange takes place ( Figure below ). The transfer of oxygen into the blood is through simple diffusion. Answer: simple diffusion

Ex Output:
How is oxygen transferred into the bloodstream?