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  1. 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 …

  2. 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, …

  3. 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 …

  4. 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.

  5. 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, …

  6. 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, …

  7. Life | Definition, Origin, Evolution, Diversity, & Facts | Britannica

    Jan 21, 2026 · The several branches of science that reveal the common historical, functional, and chemical basis of the evolution of all life include electron microscopy, genetics, paleobiology …

  8. Life - Genetics, Evolution, Biology | Britannica

    Jan 21, 2026 · Life - Genetics, Evolution, Biology: All organisms on Earth, from the tiniest cell to the loftiest trees, display extraordinary powers.

  9. 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 …

  10. 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 …