In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Input: Consider Input: Question: Exposure to what can increase the amount of pigment in the skin and make it appear darker? Answer: ultraviolet radiation

Output: Exposure to ultraviolet radiation can increase the amount of pigment in the skin and make it appear darker.

Input: Consider Input: Question: What form when water vapor condenses in the air around specs of matter? Answer: clouds

Output: Clouds form(s) when water vapor condenses in the air around specs of matter.

Input: Consider Input: Question: The active transport of ions across the membrane causes an electrical gradient to build up across the what? Answer: plasma membrane
Output: The active transport of ions across the membrane causes an electrical gradient to build up across the plasma membrane.