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.

[Q]: Question: A _____ in the population cold lead to less food availability. 
 Answer: increase
[A]: As the population increases, the food supply, or the supply of another necessary resource, may decrease.


[Q]: Question: If Mary is taking a picture and she shuts the camera shutter narrower what will happen to the amount of light that gets in? 
 Answer: decrease
[A]: A camera shutter stays open longer in dim light to let more light in.


[Q]: Question: David is getting ready to fly into space on a rocket. As the rocket shoots upwards, part of the mass attaches, allowing the rocket to go 
 Answer: lower
[A]:
By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.