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.

Q: Question: Terry replaces cut down trees in the forest. The air is now _____ dry. 
 Answer: less

A: With fewer trees, the air is drier and droughts are more common.
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Q: Question: The lighter someone's skin is the _____ melanin they have. 
 Answer: less

A: However, the melanocytes of people with darker skin produce more melanin.
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Q: Question: A family that is enormous, compared to a family that is very small, will have allele differences that are 
 Answer: greater

A:
The smaller a population is, the more allele frequencies may drift.
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