Denitrifying bacteria covert nitrogen into usable forms for plants in a process called nitrogen fixation. They are an essential part of the nitrogen cycle.
Write a paragraph to inform a reader ?
Well, your question is "How" do you answer the question, so I won't give you the answers (because I have no clue anyways)
Your simply answer 7-15 by filling in the missing word in the box. The sentences are missing words, and you have to find the correct form of that word that fits the sentence and makes it complete. In spanish, of course.
~Hope this helps!