The tunica externa (New Latin "outer coat"), also known as the tunica adventitia (New Latin "additional coat")(or adventitia for short), is the outermost tunica (layer) of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and, in arteries, is supported by external elastic lamina.
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I think the major components are: sand and gravel, silts and clays, dead organic material, fauna and flora, water, and air and specific types of microorganisms.
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Female Athlete Triad
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Nutrition imbalance can lead to a potentially dangerous set of symptoms known as the female athlete triad. A lack of sufficient nutrition can cause menstrual dysfunction. Menstrual dysfunction can cause hormonal imbalance. Hormonal imbalance can cause low bone density which ultimately causes osteoporosis.
Pure substances that have properties entirely different from the atoms that make it up are called compounds. All compounds are made up of molecules, but not all the molecules are compounds. Compounds are composed of more than one mixture of atoms.
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A-A population of butterflies includes alleles for both yellow and green butterflies. A butterfly predator sees yellow more easily than it does green
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