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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, …

  2. 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, …

  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. Eukaryotic vs. prokaryotic cells: Key differences explained

    The location, importance, and mechanisms of photosynthesis. Study the roles of chloroplasts, chlorophyll, grana, thylakoid membranes, and stroma in photosynthesis.

  5. 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 …

  6. 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 …

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

    Dec 1, 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 …

  9. Asexual reproduction | biology | Britannica

    The possibilities for debate that arise in these special cases, however, do not in any way invalidate the general usefulness of the distinctions as conventionally made in biology.

  10. Cell - Differentiation, Organelles, Cytoplasm | Britannica

    Dec 10, 2025 · Over a period of time, the genetic information in RNA sequences was transferred to DNA sequences, and the ability of RNA molecules to replicate directly was lost. It was only …