1. Atoms: The basic building blocks of matter.
2. Molecules: Two or more atoms bonded together.
3. Organelles: Specialized structures within cells that perform specific functions (e.g., mitochondria, nucleus).
4. Cells: The fundamental unit of life, containing organelles.
5. Tissues: Groups of similar cells working together to perform a specific function (e.g., muscle tissue, nervous tissue).
6. Organs: Structures composed of different tissues that work together for a common purpose (e.g., heart, lungs).
7. Organ Systems: Groups of organs that cooperate to carry out major bodily functions (e.g., digestive system, circulatory system).
8. Organisms: A complete living being made up of organ systems.
9. Populations: Groups of individuals of the same species living in the same area.
10. Communities: All the populations of different species living and interacting in a particular area.
11. Ecosystems: A community of organisms interacting with their physical environment.
12. Biomes: Large-scale ecosystems characterized by similar climate and vegetation.
13. Biosphere: The sum of all ecosystems on Earth, the part of Earth that supports life.
