Answer: A
Explanation:
Oxygen makes up another 20 to 21 percent of our atmosphere. It's essential for life on Earth, and interestingly enough, it is poisonous when highly concentrated. Our concentration of 20 to 21 percent seems just right.
Knowledge is very important for us for better understanding, for easy study.
<h3>
What is a body of knowledge that explains the natural world?</h3>
Science is an organized way of using evidence to learn about the natural world. The world science also refers to the body of knowledge that scientists have built up after years of using this process. It is the science with the help of which we can study the nature deeply without and difficulties. It is the science which make the things very easy for us and make for us very easy to be studied. Without the knowledge we can't able to understand the world in a quite easy manner.
So we can conclude that: Knowledge is very important for us for better understanding, for easy study.
Learn more about Natural World here: brainly.com/question/13142293
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Chromosomes. and these words are only because it needs to be 20 characters
