During aerobic respiration, h2o is formed. where do the oxygen atoms in the h2o come from?

Oxygen atoms come from ... Molecular Oxygen

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you