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.

[EX Q]: 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'
[EX A]: With higher levels of dissolved carbon dioxide in ocean water, the water becomes more acidic.

[EX Q]: Question: Mike needed to get a dark picture . In order to get the darkest photo, Mike made the exposure 
 Answer: shorter
[EX A]: The longer the exposure, the more light that the telescope can gather to make the image.

[EX Q]: Question: Low frequency bass notes have what length wavelengths 
 Answer: long
[EX A]:
Longer wavelength electromagnetic waves have lower frequencies, and shorter wavelength waves have higher frequencies.