| A | B |
|---|
| atom | smallest structure that makes up all gases, liquid and solid |
| electron | negative charge |
| elements | made up of only one kind of atom |
| oxygen | an example of an element |
| compound | made up of two or more elements |
| table salt | sodium and chlorine |
| carbohydrates | compound that stores energy |
| carbon, hydrogen and oxygen | elements in carbohydrates |
| nucleic acid | compound in hereditary material |
| DNA | example of nucleic acid |
