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  2. List of unsolved problems in biology - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Homochirality is an obvious characteristic of life on Earth, yet extraterrestrial samples contain largely racemic compounds. [7] It is not known whether homochirality existed before life, whether the building blocks of life must have this particular chirality, or whether life must be homochiral at all.

  3. Ring species - Wikipedia

    en.wikipedia.org/wiki/Ring_species

    In biology, a ring species is a connected series of neighbouring populations, each of which interbreeds with closely sited related populations, but for which there exist at least two "end populations" in the series, which are too distantly related to interbreed, though there is a potential gene flow between each "linked" population and the next ...

  4. 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 ...

  5. List of paradoxes - Wikipedia

    en.wikipedia.org/wiki/List_of_paradoxes

    When the model becomes accurate, it is just as difficult to understand as the real-world processes it represents. Buttered cat paradox: Humorous example of a paradox from contradicting proverbs. Intentionally blank page: Many documents contain pages on which the text "This page intentionally left blank" is printed, thereby making the page not ...

  6. Cellular respiration - Wikipedia

    en.wikipedia.org/wiki/Cellular_respiration

    Although cellular respiration is technically a combustion reaction, it is an unusual one because of the slow, controlled release of energy from the series of reactions. Nutrients that are commonly used by animal and plant cells in respiration include sugar , amino acids and fatty acids , and the most common oxidizing agent is molecular oxygen ...

  7. From New Leadership to Vicarious Punching, The ‘Leverage ...

    www.aol.com/leadership-vicarious-punching...

    Hitter. Hacker. Grifter. Thief. Brains. For five seasons on TNT, “Leverage” followed four lone wolf criminals — led by former insurance investigator, Nathan Ford (Timothy Hutton) — turned ...

  8. Biochemical cascade - Wikipedia

    en.wikipedia.org/wiki/Biochemical_cascade

    An example would be the coagulation cascade of secondary hemostasis which leads to fibrin formation, and thus, the initiation of blood coagulation. Another example, sonic hedgehog signaling pathway , is one of the key regulators of embryonic development and is present in all bilaterians . [ 2 ]

  9. Redemption Playoff: For Ryan Day and others, there's ... - AOL

    www.aol.com/sports/redemption-playoff-ryan-day...

    A win — and then a real challenge against No. 2 Georgia in the quarterfinals — is what everyone wants to see. Notre Dame is talented no doubt, but national respect still needs to be seized.