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 flu vaccine was administered to residents in a large city and the vaccine was effective in lowering the risk of flu among the residents. This means that the lower risk of disease resulted in a 
 Answer: lower death rate.
[A]: With better food and less chance of disease, the death rate fell.


[Q]: Question: Jeff put a rock under very minimal metamorphosis. The rock probably _____ its original form. 
 Answer: resembles
[A]: The more extreme the amount of metamorphism, the more difficult it is to tell what the original rock was.


[Q]: Question: Compared to a box of feathers a box of bricks would be 
 Answer: heavier
[A]:
A given volume of a denser substance is heavier than the same volume of a less dense substance.