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  2. Biological life cycle - Wikipedia

    en.wikipedia.org/wiki/Biological_life_cycle

    In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...

  3. Animal - Wikipedia

    en.wikipedia.org/wiki/Animal

    Animals have structural characteristics that set them apart from all other living things: cells surrounded by an extracellular matrix [19] composed of collagen [20] [21] and; elastic glycoproteins [19] [22] motility [23] i.e. able to spontaneously move their bodies during at least part of their life cycle. a blastula stage during embryonic ...

  4. List of longest-living organisms - Wikipedia

    en.wikipedia.org/wiki/List_of_longest-living...

    There are numerous plants and animals for which the mortality rate has been observed to actually decrease with age, for all or part of the life cycle. [2] Hydra were observed for four years without any increase in mortality rate. [3] If the mortality rate remains constant, the rate determines the mean lifespan.

  5. Ediacaran biota - Wikipedia

    en.wikipedia.org/wiki/Ediacaran_biota

    The Ediacaran (/ ˌ iː d i ˈ æ k ər ə n /; formerly Vendian) biota is a taxonomic period classification that consists of all life forms that were present on Earth during the Ediacaran Period (c. 635–538.8 Mya). These were enigmatic tubular and frond-shaped, mostly sessile, organisms.

  6. Tree of life (biology) - Wikipedia

    en.wikipedia.org/wiki/Tree_of_life_(biology)

    Edward Hitchcock's fold-out paleontological chart in his 1840 Elementary Geology. Although tree-like diagrams have long been used to organise knowledge, and although branching diagrams known as claves ("keys") were omnipresent in eighteenth-century natural history, it appears that the earliest tree diagram of natural order was the 1801 "Arbre botanique" (Botanical Tree) of the French ...

  7. Sexual reproduction - Wikipedia

    en.wikipedia.org/wiki/Sexual_reproduction

    Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. [6] [7] Sexual reproduction also occurs in some unicellular eukaryotes. [2] [8] Sexual reproduction does not occur in prokaryotes, unicellular organisms without cell nuclei, such as bacteria and archaea.

  8. Life of Animals - Wikipedia

    en.wikipedia.org/wiki/Life_of_Animals

    Ḥayāt al-ḥayawān al-kubrā (The Life of Animals) is a comprehensive zoological encyclopedia written by al-Damiri. The book details the characteristics and stories of various animals , weaving together scientific facts, folklore, and moral lessons.

  9. Zoology - Wikipedia

    en.wikipedia.org/wiki/Zoology

    Zoology (UK: / z u ˈ ɒ l ə dʒ i / zoo-OL-ə-jee, US: / z oʊ ˈ ɒ l ə dʒ i / zoh-OL-ə-jee) [1] is the scientific study of animals.Its studies include the structure, embryology, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems.

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