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: Ray was traveling in rocket leaving orbit. He keeps the empty fuel containers on board so the ship can fly 
 Answer: lower
answer:
By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.


question:
Question: Brad wants to go to the gym less regularly, so that his muscles will get smaller. Another aspect of having smaller muscles means that Brad will likely be 
 Answer: weaker
answer:
Exercising muscles increases their size, and bigger muscles have greater strength.


question:
Question: The government of Canada is considering implementing more carbon taxes across the country. If these taxes were implemented, the amount of carbon dioxide emissions in the country would be expected to 
 Answer: fall
answer:

The carbon taxes encourage people to use less fossil fuel, which reduces carbon dioxide emissions.