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: Question: Simon was digging in his yard and found that the rocks that were deeper in the ground, compared to the surface rocks, were likely 
 Answer: older

Answer: Therefore, deeper rock layers must be older than layers closer to the surface.


Question: Question: When Dean went to the top of the mountain and reached the peak, he noticed that the top of the mountain, compared to the bottom, had snow in amounts that were 
 Answer: larger

Answer: Glaciers often form in the mountains because higher altitudes are colder and more likely to have snow that falls and collects.


Question: Question: Leo is working in a lab studying genotypes. He notices that the genotypes that are more fit produce 
 Answer: more offspring

Answer:
Genotypes with greater fitness produce more offspring and pass more copies of their alleles to the next generation.