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

question:
Question: Reed saw a cell through a microscope. He sees a cell has less visible mitochondria than the rest. This cell likely is _____ active compared to the others.
Answer: less
answer:
Cells that are very active would typically have more mitochondria than cells that are less active.

question:
Question: Billionaire Joey McMoneystuffs added 3 new jets to his already large fleet of personal aircraft. One day, he decided not to have them race each other, burning no fuel and adding no greenhouse gases to the atmosphere. The Earth's heat index will
Answer: decrease
answer:
If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up.