<span>An instrument used to measure the amount of knowledge a person has learned in a given subject or area is an Achievement </span>Test.
B). stratosphere is correct
The Ozone layer is actually located in the stratosphere in a region that is 10 to 50 km above the Earth.
Where are the answer choices?
I have the first 3 answers for you but I going to try to get the 4 answer for you
1. 39
2. 9
3. 62
It is difficult to say how accurate these devices are when used at home because most research on their effectiveness has been conducted in a laboratory setting.
<h3>What is a sentence?</h3>
A sentence can be defined as a group of words that is typically made up of a subject and predicate, which are used by a writer to convey a logical information to his or her audience (readers).
In this scenario, a sentence which best accomplishes this goal is re-writing the given sentence as "It is difficult to say how accurate these devices are when used at home because most research on their effectiveness has been conducted in a laboratory setting" because the important information are still present in the new sentence.
Read more on a sentence here: brainly.com/question/985037
