instruction:
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.
question:
Question: If you were to launch a cannon which ball would fly faster if everything else were the same? 
 Answer: Lighter
answer:
The mass of the particles: lighter particles will diffuse faster, because on average they move faster.


question:
Question: When April rested on the couch, as opposed to running, she noticed that her heart was beating 
 Answer: slower
answer:
Warming up exercises increases the blood flow to the muscles and increases the heart rate.


question:
Question: If a gas' particles were to become much closer, the rate of diffusion would go 
 Answer: slower
answer:

This means the rate of diffusion is much slower in liquids than in gases, because the particles of a gas are further apart and collide much less.