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: Greta yells across the canyon in the cool morning and again in the hot afternoon. The sound likely traveled _____ in the morning. 
 Answer: faster
[A]: For a given medium, sound has a slower speed at lower temperatures.


[Q]: Question: Dan falls from a single stair one day, then the next day falls down three stairs at once. After falling down one stair, compared to three, Dan will experience 
 Answer: less friction
[A]: Heavier objects press together with greater force, and this causes greater friction between them.


[Q]: Question: Eric went outside in the summer. He is _____ likely to give off heat than if it was winter. 
 Answer: more
[A]:
On a hot day, an endotherm may give off more heat by increasing blood flow to the surface of the body.