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Biology terminology

  • BacteriaAbout four billion years ago, the first life forms appeared on Earth as unicellular microorganisms. These early organisms were bacteria and archaea…
  • Hybrid (biology)A mule is a sterile hybrid of a male donkey and a female horse. This creature stands smaller than horses but stronger than donkeys, making it useful as pack…
  • ArchaeaIn 1977, microbiologist Carl Woese and his colleague George Fox stood before a set of ribosomal RNA sequences that defied all existing biological logic.
  • EukaryoteThe word eukaryote comes from Greek roots meaning true kernel, referring to the nucleus inside a cell. This defining feature separates them from bacteria and…
  • AnimalAnimals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia. With few exceptions, animals consume organic material and…
  • SpeciesIn 1942, Ernst Mayr published a definition that would dominate biology for decades. He stated a species is the largest group of organisms in which any two…