Fill in the information missing in the table to the right by selecting the appropriate answer from the
drop-down menu.
Carbo-
hydrates
Nucleic
Proteins
Acids
A
Elements in
Molecules
carbon
hydrogen
oxygen
А
B
B
Building
Block
с
E
D
E
Where

what are the options?

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.