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  2. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 40 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .

  3. Endochondral ossification - Wikipedia

    en.wikipedia.org/wiki/Endochondral_ossification

    The initiation of endochondral ossification starts by proliferation and condensation of mesenchymal cells in the area where the bone will eventually be formed. Subsequently, these mesenchymal progenitor cells differentiate into chondroblasts, which actively synthesize cartilage matrix components.

  4. Preformationism - Wikipedia

    en.wikipedia.org/wiki/Preformationism

    In the history of biology, preformationism (or preformism) is a formerly popular theory that organisms develop from miniature versions of themselves. Instead of assembly from parts, preformationists believed that the form of living things exist, in real terms, prior to their development. [1]

  5. Embryology - Wikipedia

    en.wikipedia.org/wiki/Embryology

    1 - morula, 2 - blastula 1 - blastula, 2 - gastrula with blastopore; orange - ectoderm, red - endoderm. Embryology (from Greek ἔμβρυον, embryon, "the unborn, embryo"; and -λογία, -logia) is the branch of animal biology that studies the prenatal development of gametes (sex cells), fertilization, and development of embryos and fetuses.

  6. Embryo - Wikipedia

    en.wikipedia.org/wiki/Embryo

    An embryo is the initial stage of development for a multicellular organism.In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell.

  7. Dwayne Johnson Says Controversy Over Set Behavior Is ... - AOL

    www.aol.com/dwayne-johnson-says-controversy-over...

    Dwayne Johnson admitted in a new GQ magazine cover story that he is late to set sometimes and has peed in water bottles to save time during filming, two claims that were at the center of a viral ...

  8. Bilaminar embryonic disc - Wikipedia

    en.wikipedia.org/wiki/Bilaminar_embryonic_disc

    The main theory states that formation of the membranes of the yolk sac begins with an increase in production of hypoblast cells, followed by different patterns of migration. On day eight, the first portion of hypoblast cells begin their migration and make what is known as the primary yolk sac, or Heuser's membrane (exocoelomic membrane).

  9. “I Hate People!”: Kaley Cuoco Sparks Massive Outrage For ...

    www.aol.com/hate-people-kaley-cuoco-sparks...

    Image credits: kaleycuoco Many argued that the dog deserved to remain part of Kaley’s family, regardless of the challenges. “One day he’ll be out her life and she’s going to regret that ...