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.

Question: Willard dug up a rock from near the surface, and realized it was _____. 
 Answer: young
Therefore, deeper rock layers must be older than layers closer to the surface.

Question: If you were to launch a cannon which ball would fly faster if everything else were the same? 
 Answer: Lighter
The mass of the particles: lighter particles will diffuse faster, because on average they move faster.

Question: Species that diverged more recently than two other species diverged will have _____ differences in their DNA. 
 Answer: less

The longer the amount of time since species diverged, the more differences there will be in their DNA or proteins.