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: Bob is testing samples of ocean water from different places. The sample of water from off India's coast has less dissolved carbon dioxide, than the sample of water from off the United States' coast. Therefore, the water from _____ coast is more acidic.
Answer: United States'
With higher levels of dissolved carbon dioxide in ocean water, the water becomes more acidic.

Question: Will has a pully with 5 rope segments. Alan's pully has an equal size rope with 7 segments. Which person needs less force to do the same job?
Answer: Alan
The more rope segments on a pully that are helping to do the lifting work, the less force that is needed for the job.

Question: Noah compares the density of the water in a pond during a hot July day and a cold winter morning. The water on the winter morning is
Answer: more dense
Lower temperature and higher salinity yield the densest water.