You need to a pH strip to test the sample of water in order to answer. Red is acid and blue is basic and if the strip is yellow its neutral.
The answer is lipids.
<span>The sequence of DNA specifies the sequence of mRNA, which, further, specifies codes for the sequence of proteins. Simply, DNA codes for RNA and RNA codes for proteins. So, primarily, nucleic acids and proteins are basic parts of life. Even viruses contain nucleic acid and proteins. So, to reveal the history of life it is necessary to take a look on the basic of life. </span>
Answer:
D. exchanges no matter with other systems.
Explanation:
When you think of closed, think of something like a closed circuit. Nothing is effecting it from the outside and is not that common in nature. Most biological organisms are open systems such as us humans.
I'm confident it's the troposphere
