Elements 1 and 3 are used to make the most common substance in the body. what are these elements?

a. nitrogren & phosphorus
b. oxygen & hydrogen
c. hydrogen & helium
d. oxygen & sulfur

The right answer is B. Oxygen & Hydrogen.

The abundance an elements is the measure of their proportion in a given environment. Their abundance can be measured by mass, molar, atomic or volume fraction.

Hydrogen is the most abundant element in organisms or throughout the Milky Way. It composes water and organic matter. Oxygen comes in third place since it is present in the majority of organic components.

what's the rest of the question

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure