About 143,000 results
Open links in new tab
  1. Biology | Definition, History, Concepts, Branches, & Facts | Britannica

    Sep 30, 2025 · Biology is a branch of science that deals with living organisms and their vital processes. Biology encompasses diverse fields, including botany, conservation, ecology, …

  2. Biology - Evolution, Genetics, Classification | Britannica

    Sep 30, 2025 · Biology - Evolution, Genetics, Classification: There are moments in the history of all sciences when remarkable progress is made in relatively short periods of time.

  3. Biology Portal | Britannica

    The field of biology is subdivided into separate branches for convenience of study, though all the subdivisions share basic principles. Biology encompasses fields such as botany, genetics, …

  4. Biology and its branches | Britannica

    An extremely broad subject, biology is divided into branches. The current approach is based on the levels of biological organization involved (e.g., molecules, cells, individuals, populations) …

  5. Cell | Definition, Types, Functions, Diagram, Division, Theory,

    Oct 7, 2025 · cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete …

  6. Biology - Aristotle, Organisms, Cells | Britannica

    Sep 30, 2025 · Biology - Aristotle, Organisms, Cells: Around the middle of the 4th century bce, ancient Greek science reached a climax with Aristotle, who was interested in all branches of …

  7. Biology - Evolution, Genetics, Species | Britannica

    Aug 22, 2025 · Biology - Evolution, Genetics, Species: In his theory of natural selection, which is discussed in greater detail later, Charles Darwin suggested that “survival of the fittest” was the …

  8. Marine biology | Description & Facts | Britannica

    Marine biology, the science that deals with animals and plants that live in the sea. It also deals with airborne and terrestrial organisms that depend directly upon bodies of salt water for food …

  9. Biophysics | Molecular Biology, Physics & Chemistry | Britannica

    Biology, which may be viewed as a general subject pervading biophysical study, is evolving from a purely descriptive science into a discipline increasingly devoted to understanding the nature …

  10. Morphology | Definition & Examples | Britannica

    Morphology, in biology, the study of the size, shape, and structure of animals, plants, and microorganisms.