in the box provided explain why living organisms contain more hydrogen atoms than any other atoms, yet 65% of a typical organism’s mass is oxygen.

Living organisms contain more hydrogen atoms than any other atoms primarily because hydrogen is the most abundant element in water and organic molecules that make up living cells. Water, which constitutes a large part of living organisms, is composed of two hydrogen atoms and one oxygen atom, making hydrogen very plentiful. Furthermore, many biological molecules such as sugars, proteins, fats, and nucleic acids also contain hydrogen atoms bonded with carbon, oxygen, and nitrogen. This abundance stems from the prevalence of water and hydrogen-containing organic compounds in living organisms, as well as hydrogen's small size and reactivity which make it a fundamental building block in biochemistry.