Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: In a heat map, what color represents the hottest temperatures? Answer: bright yellow
A heat wave over the United States as indicated by heat radiated from the ground. The bright yellow areas are the hottest, and the blue and white are coolest.

Question: What provides the shape of a cell? Answer: cytoskeleton
The cytoskeleton provides the shape of the cell.

Question: Solar and wind are still expensive compared to what? Answer: fossil fuels
Solar and wind are still expensive relative to fossil fuels. The technology needs to advance so that the price falls.