Dec 10, 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 carry out a …

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 and …

Feb 22, 2021 · Cells are the basic building blocks of all living things. The human body is made of trillions of cells that carry out specialized functions.

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 microscopes. Since …

5 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. Plants and animals are …

All cells evolved from a common ancestor and use the same kinds of carbon-based molecules. Learn how cell function depends on a diverse group of nucleic acids, proteins, lipids, and sugars.

Cells are the basic structures of all living organisms. Different cells have different functions – such as taking in nutrients from food, providing structure for the body, or fighting infection.

Oct 28, 2025 · Cells are the basis of all life on Earth, producing every living organism, from a single cellular bacteria, through to trillions of cells making up a human. All living species on Earth have cells.

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

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. Whether in plants,...