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  2. IB Group 4 subjects - Wikipedia

    en.wikipedia.org/wiki/IB_Group_4_subjects

    Topic 1: Systems and models (5 hours) Topic 2: The ecosystem (31 hours) Topic 3: Human population, carrying capacity and resource use (39 hours) Topic 4: Conservation and biodiversity (15 hours) Topic 5: Pollution management (18 hours) Topic 6: The issue of global warming (6 hours) Topic 7: Environmental value systems (6 hours)

  3. Theory of knowledge (IB course) - Wikipedia

    en.wikipedia.org/wiki/Theory_of_knowledge_(IB...

    Theory of Knowledge is a course created by the IB organization and must not be conceived as pure epistemology. This course involves a process of exploring and sharing students' views on "knowledge questions" (an umbrella term for "everything that can be approached from a TOK point of view"), so "there is no end to the valid questions that may arise", "there are many different ways to approach ...

  4. List of unsolved problems in biology - Wikipedia

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

    Developmental psychobiology posed this question since the lack of knowledge about the precise coordination of all cells, even those not related anatomically, in space and time during the embryonic period does not allow us to understand what forces at the cellular level coordinate four very general classes of tissue deformation, namely: tissue ...

  5. IB Group 5 subjects - Wikipedia

    en.wikipedia.org/wiki/IB_Group_5_subjects

    The Group 5: Mathematics subjects of the IB Diploma Programme consist of two different mathematics courses, both of which can be taken at Standard Level (SL) or Higher Level (HL). [1] To earn an IB Diploma, a candidate must take either Mathematics Applications and Interpretation (SL/HL) or Mathematics Analysis and Approaches (SL/HL), as well as ...

  6. Meselson–Stahl experiment - Wikipedia

    en.wikipedia.org/wiki/Meselson–Stahl_experiment

    It has been called "the most beautiful experiment in biology". [1] Meselson and Stahl decided the best way to trace the parent DNA would be to tag them by changing one of its atoms. Since nitrogen is present in all of the DNA bases, they generated parent DNA containing a heavier isotope of nitrogen than would be present naturally. This altered ...

  7. IB Group 2 subjects - Wikipedia

    en.wikipedia.org/wiki/IB_Group_2_subjects

    [2] Curriculum. For students to achieve communicative competence in a variety of situations, the following core topics are explored in the Language ab initio course: the individual, education and work, town and services, food and drink, leisure and travel, the environment, health and emergencies. The language skills that are taught and assessed ...

  8. Iron in biology - Wikipedia

    en.wikipedia.org/wiki/Iron_in_biology

    Of this, about 2.5 g is contained in the hemoglobin needed to carry oxygen through the blood (around 0.5 mg of iron per mL of blood), [25] and most of the rest (approximately 2 grams in adult men, and somewhat less in women of childbearing age) is contained in ferritin complexes that are present in all cells, but most common in bone marrow ...

  9. Hershey–Chase experiment - Wikipedia

    en.wikipedia.org/wiki/Hershey–Chase_experiment

    While DNA had been known to biologists since 1869, [2] many scientists still assumed at the time that proteins carried the information for inheritance because DNA appeared to be an inert molecule, and, since it is located in the nucleus, its role was considered to be phosphorus storage.

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