Answer:
Molecule and organelles
Step-by-step explanation:
- An atom is the smallest and most fundamental unit of matter, it is the lowest level of organization.
- Atoms then form molecules. Molecules are structures that contain two or more atoms that are held together by chemical bonds.
- Molecules in turn form macromolecules such as DNA, by joining of smaller units called monomers. The aggregates of macromolecules then form organelles that are surrounded by membranes.