Most organic compounds contain carbon and . I know that the blank that would be filled in is oxygen, but why would it be oxygen?

Actually the answer is hydrogen

Explanation:

According to https://www.texasgateway.org/resource/organic-or-inorganic

Most organic compounds contain carbon, hydrogen, and sometimes other elements such as nitrogen, sulfur, oxygen, or phosphorus. All living organisms contain carbon—even bacteria. Earlier when you were looking at the pictures, sugar was identified as organic.

The blank is not to be filled with only oxygen organic compounds also contain other elements such as hydrogen, nitrogen, phosphorus and sulphur.

Hope this was of some help

Hope this was of some help ALL THE BEST !!

option number one would be youre best option

helicase, i think thats it