In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Example Input: Question: Gina has longer fingernails than John. Who has more cells on their nails? 
 Answer: Gina
Example Output: As the nail grows, more cells are added at the nail bed.

Example Input: Question: Carla is pushing two carts down a street. One cart is heavy, the other is light. The light cart, compared to the heavy one, will accelerate 
 Answer: quickly
Example Output: The greater the mass of an object, the less it will accelerate when a given force is applied.

Example Input: Question: The rocks that are on the surface of a volcano are 
 Answer: young
Example Output:
The upper rock layers are much younger.