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Why are scientists concerned about the depletion of the ozone levels in the stratosphere?
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When plants use sunlight to make food, the energy of sunlight is
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Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.
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If a cell with a diploid number of two undergoes meiosis and nondisjunction occurs during meiosis II...
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