About 836,000 results
Open links in new tab
  1. Biology | Definition, History, Concepts, Branches, & Facts | Britannica

    Dec 5, 2025 · 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

    Dec 5, 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. Such leaps in …

  4. Biology - Aristotle, Organisms, Cells | Britannica

    Dec 5, 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 knowledge, …

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

    Dec 1, 2025 · A cell, in biology, is the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell may be a complete …

  6. 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 basis …

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

    Biophysics, discipline concerned with the application of the principles and methods of physics and the other physical sciences to the solution of biological problems. The relatively recent emergence of …

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

    Nov 4, 2025 · 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. Cell - Differentiation, Organelles, Cytoplasm | Britannica

    Dec 1, 2025 · Cell - Differentiation, Organelles, Cytoplasm: Adult organisms are composed of a number of distinct cell types. Cells are organized into tissues, each of which typically contains a small …

  10. Branches of 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 …