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  2. Barter - Wikipedia

    en.wikipedia.org/wiki/Barter

    A barter transaction "moves objects between the regimes of value", meaning that a good or service that is being traded may take up a new meaning or value under its recipient than that of its original owner. [13] There is no criterion of value. There is no real way to value each side of the trade.

  3. Reciprocity (cultural anthropology) - Wikipedia

    en.wikipedia.org/wiki/Reciprocity_(cultural...

    When the exchange is immediate, as in barter, it does not create a social relationship. When the exchange is delayed, it creates both a relationship as well as an obligation for a return (i.e. debt). Hence, some forms of reciprocity can establish a hierarchy if the debt is not repaid.

  4. List of Latin and Greek words commonly used in systematic ...

    en.wikipedia.org/wiki/List_of_Latin_and_Greek...

    Latin/Greek Language English Example Search for titles containing the word or using the prefix: acanthus etc.: G ἄκανθος (ákanthos): thorny, spiny: Acanthus plant; Parorchis acanthus, a flatworm

  5. Glossary of biology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_biology

    This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...

  6. Trade - Wikipedia

    en.wikipedia.org/wiki/Trade

    Traders generally negotiate through a medium of credit or exchange, such as money. Though some economists characterize barter (i.e. trading things without the use of money [1]) as an early form of trade, money was invented before written history began. Consequently, any story of how money first developed is mostly based on conjecture and ...

  7. Bartter syndrome - Wikipedia

    en.wikipedia.org/wiki/Bartter_syndrome

    Bartter syndrome (BS) is a rare inherited disease characterised by a defect in the thick ascending limb of the loop of Henle, which results in low potassium levels (hypokalemia), [2] increased blood pH (), and normal to low blood pressure.

  8. Glossary of history - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_history

    Also eon. age Age of Discovery Also called the Age of Exploration. The time period between approximately the late 15th century and the 17th century during which seafarers from various European polities traveled to, explored, and charted regions across the globe which had previously been unknown or unfamiliar to Europeans and, more broadly, during which previously isolated human populations ...

  9. History of biology - Wikipedia

    en.wikipedia.org/wiki/History_of_biology

    The history of biology traces the study of the living world from ancient to modern times. Although the concept of biology as a single coherent field arose in the 19th century, the biological sciences emerged from traditions of medicine and natural history reaching back to Ayurveda, ancient Egyptian medicine and the works of Aristotle, Theophrastus and Galen in the ancient Greco-Roman world.