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  2. Timeline of the evolutionary history of life - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the...

    Dates in this article are consensus estimates based on scientific evidence, mainly fossils. In biology, evolution is any change across successive generations in the heritable characteristics of biological populations.

  3. Date palm - Wikipedia

    en.wikipedia.org/wiki/Date_palm

    Phoenix dactylifera, commonly known as the date palm, [2] is a flowering-plant species in the palm family Arecaceae, cultivated for its edible sweet fruit called dates. The species is widely cultivated across northern Africa , the Middle East , the Horn of Africa , Australia , South Asia , and California . [ 3 ]

  4. Timeline of human evolution - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_evolution

    Date Event 4.3-4.1 Ga: The earliest life appears, possibly as protocells. Their genetic material was probably composed of RNA, capable of both self replication and enzymatic activity; their membranes were composed of lipids. The genes were separate strands, translated into proteins and often exchanged between the protocells.

  5. History of anatomy - Wikipedia

    en.wikipedia.org/wiki/History_of_anatomy

    The history of anatomy spans from the earliest examinations of sacrificial victims to the advanced studies of the human body conducted by modern scientists. Written descriptions of human organs and parts can be traced back thousands of years to ancient Egyptian papyri , where attention to the body was necessitated by their highly elaborate ...

  6. Relative dating - Wikipedia

    en.wikipedia.org/wiki/Relative_dating

    Craters are very useful in relative dating; as a general rule, the younger a planetary surface is, the fewer craters it has. If long-term cratering rates are known to enough precision, crude absolute dates can be applied based on craters alone; however, cratering rates outside the Earth-Moon system are poorly known. [8]

  7. List of organs of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_organs_of_the...

    This article contains a list of organs in the human body. It is widely believed that there are 79 organs (this number goes up if you count each bone and muscle as an organ on their own, which is becoming a more common practice [1] [2]); however, there is no universal standard definition of what constitutes an organ, and some tissue groups' status as one is debated. [3]

  8. File:Internal organs.svg - Wikipedia

    en.wikipedia.org/wiki/File:Internal_organs.svg

    By this method, body diagrams can be derived by pasting organs into one of the "plain" body images shown below. This method requires a graphics editor that can handle transparent images, in order to avoid white squares around the organs when pasting onto the body image. Pictures of organs are found on the project's main page. These were ...

  9. Absolute dating - Wikipedia

    en.wikipedia.org/wiki/Absolute_dating

    Dendrochronology can date the time at which tree rings were formed, in many types of wood, to the exact calendar year. Dendrochronology has three main areas of application: paleoecology , where it is used to determine certain aspects of past ecologies (most prominently climate); archaeology , where it is used to date old buildings, etc.; and ...