Sep 30, 2025 · Biology is a branch of science that deals with living organisms and their vital processes. Biology encompasses diverse fields, including botany, conservation, ecology, …

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, …

Oct 21, 2025 · Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double …

Oct 16, 2025 · An overview of the origins and history of cats, how they are identified, their body types and features, and their senses, behavior, and heredity.

Oct 7, 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 …

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) …

Sep 30, 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.

Take this Biology Quiz at Enyclopedia Britannica to test your knowledge of scientists, animals and marine life.

Oct 7, 2025 · Viral vector, in molecular biology, a tool used to deliver genetic material to cells. Viruses are useful delivery tools, owing to their efficiency in locating and entering target cells.

Sep 30, 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 …