which compound features two hydrogen atoms and one oxygen atom, and is necessary for life?\nwater\nammonia\na…

Brief Explanations:

Water has a chemical formula of H₂O, meaning it has two hydrogen atoms and one oxygen atom. It is essential for life - forms for processes like metabolism, transport of nutrients, and maintaining cell structure. Ammonia is NH₃, amino - acids have a more complex structure with elements like carbon, hydrogen, oxygen, nitrogen etc., and phosphate contains phosphorus along with oxygen and other elements.

Answer:

Water