Cell theory, developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure …

Dec 1, 2025 · Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Most cells have one or more nuclei and other organelles that …

Aug 21, 2025 · In biology, a cell is the fundamental structural and functional unit of all living organisms. They are basic membrane-bound units that contain the necessary molecules of …

2 days ago · All cells can be sorted into one of two groups: eukaryotes and prokaryotes. A eukaryote has a nucleus and membrane-bound organelles, while a prokaryote does not. …

Learn how cells work together in tissues, organs, and organ systems. In 1665, Robert Hooke coined the term cell to describe the structures he could see in cork with some of the first …

Cells are the microscopic units that make up living organisms. Learn about the characteristics and structures that all cells have in common.

Some cells are organisms unto themselves; others are part of multicellular organisms. All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates...

All living things are made of cells. They are the basic building blocks of life. The human body is composed of trillions of cells, all with their own specialised function.

Nov 18, 2024 · As is often repeated, cells are the basic building blocks of all life. They are responsible for generating the energy that sustains life, eliminating waste, and replicating to …

Oct 15, 2025 · Cells are the basic units of life. The body contains trillions of cells, which vary widely in size, number, structure, and function. Cells also communicate with each other. …