Which two elements make up the most common compound in the human body?

The two elements that makes the most common compound in the body are hydrogen and oxygen.

Explanation:

The three most abundant elements in the human body are oxygen, carbon and hydrogen. Oxygen constitute 65% of the body mass, carbon constitute 18% while hydrogen constitute 9.5% of the human body. Most of the element found in the body are found within the compound in the body.

The most known compounds present in the human body are water, protein, carbohydrate, Fat and mineral . The most abundant compound found in the body is water which constitute about 62% . Most of the hydrogen  found in the body are embedded in water. The oxygen too in the water molecule also reflects the abundant of oxygen in the body.

The two elements that makes up the most common compound in the body is definitely oxygen and hydrogen.

the correct answer is:

a population changes in response to a change in the environment.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."