The answer is the letter B. Amount of restriction measured in inches of water. <span>The restriction measuring devices are used to extend the filter's useful life, that is, they maximize the filter's useful life, which significantly reduces maintenance costs.</span>
Answer:
The last ice age
Explanation:
https://www.syvum.com/cgi/online/mult.cgi/exam/regents/earth_science/jun_2017.tdf?2