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: Air pressure is higher in the 
 Answer: valleys.
Example Output: Air pressure is less at higher elevations.

Example Input: Question: Mike is watching how particles of reactants function, and sees that they are very far apart. Considering that the concentration of them is very low, the chance of them colliding together is 
 Answer: low
Example Output: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.

Example Input: Question: Kathy did some experiments on two different alkanes and one of the alkanes had twice as many carbon atoms than the other. She would notice that which alkane would require a higher temperature to melt 
 Answer: alkane with more carbon atoms?
Example Output:
Alkanes with more carbon atoms have higher boiling and melting points, so some of them are solids at room temperature.