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  2. Advanced Placement - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement

    Advanced Placement ( AP) [4] is a program in the United States and Canada created by the College Board. AP offers undergraduate university-level curricula and examinations to high school students. Colleges and universities in the US and elsewhere may grant placement and course credit to students who obtain qualifying scores on the examinations.

  3. AP Biology - Wikipedia

    en.wikipedia.org/wiki/AP_Biology

    Russian Language and Culture (discontinued 2010) v. t. e. Advanced Placement ( AP) Biology (also known as AP Bio) is an Advanced Placement biology course and exam offered by the College Board in the United States. For the 2012–2013 school year, the College Board unveiled a new curriculum with a greater focus on "scientific practices".

  4. Advanced Placement exams - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement_exams

    Advanced Placement ( AP) examinations are exams offered in United States by the College Board and are taken each May by students. The tests are the culmination of year-long Advanced Placement (AP) courses, which are typically offered at the high school level. AP exams (with few exceptions [1]) have a multiple-choice section and a free-response ...

  5. Green, red and purple: The colorful science behind the ...

    www.aol.com/weather/green-red-purple-colorful...

    Purple and blue are related to nitrogen, with purple lights appearing higher than 60 miles above the ground while blue hues glow below this threshold. Green, red and purple aurora over Mefjord in ...

  6. Allelopathy - Wikipedia

    en.wikipedia.org/wiki/Allelopathy

    Allelopathy is a biological phenomenon by which an organism produces one or more biochemicals that influence the germination, growth, survival, and reproduction of other organisms. These biochemicals are known as allelochemicals and can have beneficial (positive allelopathy) or detrimental (negative allelopathy) effects on the target organisms ...

  7. Impossible color - Wikipedia

    en.wikipedia.org/wiki/Impossible_color

    Impossible color. The human eye's red-to-green and blue-to-yellow values of each one-wavelength visible color [citation needed] Human color sensation is defined by the sensitivity curves (shown here normalized) of the three kinds of cone cells: respectively the short-, medium- and long-wavelength types. Impossible colors are colors that do not ...

  8. Is Seeing a Spider a Good Omen? What To Know About the ... - AOL

    www.aol.com/lifestyle/seeing-spider-good-omen...

    4 Spiritual Meanings of Spiders. 1. Destiny. Again, spiders are seen as "weavers of fate." 2. Destruction. Popescu shares about the multifaceted spider symbols: "As the web can ensnare, they may ...

  9. Spiritual ecology - Wikipedia

    en.wikipedia.org/wiki/Spiritual_ecology

    Spiritual ecology. Spiritual ecology is an emerging field in religion, conservation, and academia that proposes that there is a spiritual facet to all issues related to conservation, environmentalism, and earth stewardship. [1] Proponents of spiritual ecology assert a need for contemporary nature conservation work to include spiritual elements ...