b is the right answer because we breathe oxygen and when we breathe out we let out carbon dioxide
Answer:
B i think
im not really sure bc i failed this subject but remember sum so
People can do a number of ways to narrow down the definition of a word or words.
-They fins synonyms of the word.
-An example of the word.
-They find the antonym of the word or the opposite definition.
-They can use word parts, because certain prefix or suffix help determine the words definition before you know it.
<span />
Molecular nitrogen has to be fixed in order to be in the soil. This is achieved by living organisms or lightning naturally or man can fix nitrogen in the process of making fertilizer.
