1. Atoms: The basic building blocks of matter, including elements like carbon, hydrogen, oxygen, and nitrogen.
2. Molecules: Combinations of atoms, forming structures like water (H₂O) and proteins.
3. Organelles: Specialized structures within cells, like mitochondria, the nucleus, and chloroplasts.
4. Cells: The fundamental unit of life, capable of carrying out all life processes.
5. Tissues: Groups of similar cells working together to perform a specific function, such as muscle tissue or nervous tissue.
6. Organs: Structures made of different tissues that work together for a common purpose, like the heart, lungs, or brain.
7. Organ Systems: Groups of organs that cooperate to carry out major bodily functions, like the digestive system or circulatory system.
8. Organism: A complete living being, made up of multiple organ systems working together, such as a plant, animal, or fungus.
9. Population: A group of individuals of the same species living in the same area.
10. Community: All the different populations of organisms living and interacting in a particular area.
11. Ecosystem: A community of organisms interacting with their physical environment, including factors like soil, water, and sunlight.
12. Biome: A large-scale ecosystem characterized by distinct climate and vegetation, such as a forest, desert, or grassland.
13. Biosphere: The entire portion of Earth that supports life, including all living organisms and their physical environment.
