Given a scientific question, generate a correct answer to it.

Example Input: What are the two most common vision problems?
Example Output: nearsightedness and farsightedness

Example Input: Solar cells create voltages directly from light, while thermoelectric devices create voltage from differences in what?
Example Output: temperature

Example Input: Movement of water and minerals in the xylem solutes, pressure, gravity, and matric potential are all important for what?
Example Output:
plant water transport