Answer:
A. It's a reliable source because it's from the government, not a website based on other people's opinions.
The answer is: It spins a sample to separate based on density.
It helps the plants create oxygen for us to breathe
<h2><em>Why is it sometimes hard to establish an MPA?</em></h2>
- <em>Arguably, it is difficult to declare such an MPA successful, when <u>the human populations responsible for degradation have been removed</u>, and its mere establishment is rife with such political contention. Issues also arise when considering the resources needed to support a large-scale MPA.</em>
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Answer:
The scientist is studying oxygen which can also be found in protien. oxygen is the element which makes up to 65% of human body mass. It is also found in proteins inside the body.