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.

[EX Q]: 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
[EX A]: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.

[EX Q]: Question: Mike adds more and more resistors into his parallel circuit, which causes the total current strength to 
 Answer: increase
[EX A]: As more resistors are added in parallel, the total current strength increases.

[EX Q]: Question: As Brian descended Mount Everest, there was _____ air. 
 Answer: more
[EX A]:
At higher elevations, there is less air to press on a given area.