TASK DEFINITION: You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.
PROBLEM: Question: Dogs, compared to camels, will have differences in their DNA that is 
 Option1: less 
 Option2: more 
 Explanation: The longer the amount of time since species diverged, the more differences there will be in their DNA or proteins.

SOLUTION: more

PROBLEM: Question: As the rocket falls down through the troposphere and gets nearer to the Earth's surface, the air will be 
 Option1: warmer 
 Option2: cooler 
 Explanation: Air in the troposphere is warmer closer to Earths surface.

SOLUTION: warmer

PROBLEM: Question: Dan is looking at shells that will be good candidates for fossilization. He chooses the shells that are 
 Option1: softer 
 Option2: harder 
 Explanation: Hard shells fossilize more readily than soft bodied organisms, as they are better at resisting decay, take significantly longer to break down, and have a greater chance of surviving burial under layers of sediment.

SOLUTION:
harder