TASK DEFINITION: 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.
PROBLEM: Question: Reid analyzes particle speed. The heaviest particle he sees likely diffuses _____ than the lightest particle.
Answer: slower

SOLUTION: The mass of the particles: lighter particles will diffuse faster, because on average they move faster.

PROBLEM: Question: Carol is building a small rocket to test in her back yard and, after much consideration, decides to use a biofuel to power her rocket. She tells her friends it's because it will create _____ carbon dioxide than fossil fuels.
Answer: less

SOLUTION: The advantage to biofuels is that they burn more cleanly than fossil fuels. As a result, they create less pollution and less carbon dioxide.

PROBLEM: Question: Billy was taking care of his plants and noticed that the leaves on them were different. On one he could actually see his own image reflected back on the leaves while the other he couldn't see himself at all. He concluded that the one he couldn't see his image on had
Answer: less sheen

SOLUTION:
Increases the sheen on leaves to make them more reflective.