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  1. Biology | Definition, History, Concepts, Branches, & Facts | Britannica

    Jan 12, 2026 · Biology is a branch of science that deals with living organisms and their vital processes. Biology encompasses diverse fields, including botany, conservation, ecology, evolution, genetics, …

  2. 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, marine …

  3. Biology - Evolution, Genetics, Classification | Britannica

    Jan 12, 2026 · Biology - Evolution, Genetics, Classification: There are moments in the history of all sciences when remarkable progress is made in relatively short periods of time.

  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) and on the …

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

    5 days ago · 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 organism in itself, …

  6. 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 and other …

  7. Biology - Aristotle, Organisms, Cells | Britannica

    Jan 12, 2026 · 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 knowledge, …

  8. Reproduction | Definition, Examples, Types, Importance, & Facts ...

    Jan 29, 2026 · Reproduction, process by which organisms replicate themselves. Reproduction is one of the most important concepts in biology: it means making a copy, a likeness, and thereby providing …

  9. Biology - Evolution, Genetics, Species | Britannica

    Jan 12, 2026 · 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 basis …

  10. Biology - Origin, Evolution, Life | Britannica

    Jan 12, 2026 · Biology - Origin, Evolution, Life: If a species can develop only from a preexisting species, then how did life originate?