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  • Life | Definition, Origin, Evolution, Diversity, Facts | Britannica
    Life, living matter and, as such, matter whose attributes include responsiveness, growth, metabolism, energy transformation, and reproduction Each individual is composed of one or more minimal living units, called cells, and is capable of transformation of compounds, growth, and participation in reproductive acts
  • Life Definition Meaning | Britannica Dictionary
    [noncount] : the ability to grow, change, etc , that separates plants and animals from things like water or rocks
  • Bacteriophage | Definition, Life Cycle, Research | Britannica
    A bacteriophage is any of a group of viruses that infect bacteria Bacteriophages were discovered independently by Frederick W Twort in Great Britain (1915) and Felix d’Herelle in France (1917) Thousands of varieties of phages exist Certain types serve key roles in laboratory research
  • Life expectancy | Definition Facts | Britannica
    Life expectancy, estimate of the average number of additional years that a person of a given age can expect to live It is a hypothetical measure Life expectancy assumes that the age-specific death rates for the year in question will apply throughout the lifetime of individuals born in that year
  • Archaeology | Definition, History, Types, Facts | Britannica
    Archaeology, the scientific study of the material remains of past human life and activities These include human artifacts from the very earliest stone tools to the man-made objects that are buried or thrown away in the present day
  • Christianity | Definition, Origin, History, Beliefs, Symbols, Types . . .
    Christianity is a major religion stemming from the life, teachings, and death of Jesus of Nazareth in the 1st century CE It has become the largest of the world’s religions and, geographically, the most widely diffused
  • Definition, Beliefs, Origin, Systems, Practice - Britannica
    Life is a stream of becoming, a series of manifestations and extinctions The concept of the individual ego is a popular delusion; the objects with which people identify themselves—fortune, social position, family, body, and even mind—are not their true selves
  • Plant | Definition, Evolution, Diversity, Ecology, Taxonomy | Britannica
    The life histories of plants include two phases, or generations, one of which is diploid (the nuclei of the cells contain two sets of chromosomes), whereas the other is haploid (with one set of chromosomes) The diploid generation is known as the sporophyte, which literally means spore -producing plant
  • Cnidarian | Definition, Life Cycle, Classes, Facts | Britannica
    Cnidarian, any member of the phylum Cnidaria (Coelenterata), a group of more than 9,000 species of mostly marine animals The group includes corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans Learn more about cnidarians in this article





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