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.

Example Input: Question: If Milo is measuring the seafloor and he notices the level of spreading has decreased, what will happen to the sea level? 
 Answer: it will fall
Example Output: Sea level rises if an increase in seafloor spreading rate buoys up the ocean crust, causing the ocean basin to become smaller.

Example Input: Question: Sarah ate a piece of shark meat for dinner, Sarah's levels of toxic metals have 
 Answer: increased or
Example Output: The higher up a food chain that humans eat, the greater the levels of toxic metals they take in.

Example Input: Question: Penny removed salt from her cup of water and noticed the water got _____. 
 Answer: thinner
Example Output:
If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.