Task: Explanation
Input (English): Question: Eric saw a shell of a snail that was very rare in fossil form. Compared to one that is more common, the rare snail has a shell that is _____ hard. 
 Answer: less
Output (English): 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.