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  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, …

  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, …

  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.

  4. 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 …

  5. biology - Kids | Britannica Kids | Homework Help

    Biology is the study of living things. A biologist is a scientist who studies biology. Biologists try to understand the natural world and the things that live in it. These…

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

    Dec 16, 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 …

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

    Dec 10, 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 …

  8. Biology - Origin, Evolution, Life | Britannica

    Dec 5, 2025 · Biology - Origin, Evolution, Life: If a species can develop only from a preexisting species, then how did life originate?

  9. Biology - Evolution, Genetics, Species | Britannica

    Dec 5, 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 …

  10. Life - Genetics, Evolution, Biology | Britannica

    Dec 13, 2025 · Life - Genetics, Evolution, Biology: All organisms on Earth, from the tiniest cell to the loftiest trees, display extraordinary powers.