Aresearcher discovers a small molecule in muscle tissue that is rich in nitrogen, soluble in water, and lacks phosphorus. the molecule also contains carbon, hydrogen, and oxygen, in uneven ratios. the molecule must be a(n)

It seems that you have missed the necessary options for us to answer this question, so I had to look for it and here is the answer. When a researcher discovers a small molecule in muscle tissue that is rich in nitrogen, soluble in water, and lacks phosphorus, the  molecule also contains carbon, hydrogen, and oxygen, in uneven ratios. The molecule must be an AMINO ACID. Hope this helps.