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: What is the clear, protective covering on the outside of the eye? Answer: cornea
First, light passes through the cornea of the eye. The cornea is a clear, protective covering on the outside of the eye.

Question: Where do most biochemical reactions take place? Answer: within cells
Most biochemical reactions take place within cells. Cells are the microscopic building blocks of organisms.

Question: What is the term for the length of the route between two points? Answer: distance
Distance is the length of the route between two points. The SI unit for distance is the meter (m).