1. Atoms and Elements:
* The fundamental units of matter are atoms.
* Organic matter is primarily composed of carbon, hydrogen, oxygen, nitrogen, and other elements.
2. Molecules:
* Atoms bond together to form molecules.
* Common organic molecules include carbohydrates, lipids, proteins, and nucleic acids.
3. Macromolecules:
* Large complex molecules made up of smaller repeating subunits.
* Examples:
* Carbohydrates: long chains of sugar molecules (monosaccharides)
* Lipids: fats, oils, waxes
* Proteins: chains of amino acids
* Nucleic Acids: DNA and RNA, made of nucleotides
4. Organelles:
* Specialized structures within cells that perform specific functions.
* Examples:
* Nucleus: contains genetic material (DNA)
* Mitochondria: powerhouse of the cell, produces energy (ATP)
* Ribosomes: synthesize proteins
5. Cells:
* The fundamental unit of life.
* All living organisms are made up of one or more cells.
* Cells contain various organelles and macromolecules.
6. Tissues:
* Groups of similar cells working together to perform a specific function.
* Examples:
* Epithelial tissue: lining of organs
* Connective tissue: support and structure
* Muscle tissue: movement
* Nervous tissue: communication
7. Organs:
* Structures composed of different tissues that work together to perform a specific function.
* Examples:
* Heart: pumps blood
* Lungs: exchange gases
* Brain: controls body functions
8. Organ Systems:
* Groups of organs working together to perform a major function.
* Examples:
* Circulatory system: transports blood
* Respiratory system: takes in oxygen and releases carbon dioxide
* Digestive system: breaks down food
* Nervous system: controls and coordinates body activities
9. Organism:
* A complete living individual, made up of organ systems.
* Examples:
* Humans, animals, plants
10. Population:
* A group of organisms of the same species living in the same area.
11. Community:
* All the different populations of organisms living in a particular area.
12. Ecosystem:
* A community of organisms and their physical environment.
13. Biome:
* A large-scale ecosystem characterized by a particular climate and dominant plant and animal life.
14. Biosphere:
* The sum of all living organisms and their environments on Earth.
