The earliest of roots of science, which included medicine, can be traced to ancient Egypt and Mesopotamia in around 3000 to 1200 BCE. Their contributions shaped ancient Greek See more

Cell theory states that cells are the fundamental units of life, that all living things are composed of one or more cells, and that all cells arise from preexisting cells through cell division. Most cells are very small, with diameters ranging from 1 to 100 See more

Evolutionary processes
Evolution is a central organizing concept in biology. It is the change in heritable characteristics of … See more

Ecology is the study of the distribution and abundance of life, the interaction between organisms and their environment.
Ecosystems See more

Atoms and molecules
All organisms are made up of chemical elements; oxygen, carbon, hydrogen, and nitrogen account for most (96%) of the mass of all … See more

Inheritance
Genetics is the scientific study of inheritance. Mendelian inheritance, specifically, is the process by which genes and traits are … See more

Bacteria and Archaea
Bacteria are a type of cell that constitute a large domain of prokaryotic microorganisms. Typically a few See more