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: Reid analyzes particle speed. The heaviest particle he sees likely diffuses _____ than the lightest particle. 
 Answer: slower
[EX A]: The mass of the particles: lighter particles will diffuse faster, because on average they move faster.

[EX Q]: Question: Tina cools some oxygen gas. The oxygen particles will move 
 Answer: slower
[EX A]: If the gas is heated, the particles will move faster as they gain more energy.

[EX Q]: Question: Dana wants the gas to move with as little energy as possible so the particles can move slowly. Dana will then do this to the gas 
 Answer: cool
[EX A]:
If the gas is heated, the particles will move faster as they gain more energy.