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Ninth Grade Biology
Ninth Grade Biology

... Key concept: Populations, not individuals, evolve. Main ideas: Natural Selection acts on distribution of traits. Natural selection can change the distribution of a trait in one of three ways. Section 11.3: Other Mechanisms of Evolution Key concept: Natural Selection is not the only mechanism through ...
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Hygiene hypothesis

In medicine, the hygiene hypothesis is a hypothesis that states that a lack of early childhood exposure to infectious agents, symbiotic microorganisms (e.g. gut flora or probiotics), and parasites increases susceptibility to allergic diseases by suppressing the natural development of the immune system. In particular, the lack of exposure is thought to lead to defects in the establishment of immune tolerance.The hygiene hypothesis has also been called the ""biome depletion theory"" and the ""lost friends theory"".
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