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How does a gymnosperm prevent itself from pollinating the same tree
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Which type of respiration takes place when there is no oxygen present
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During convection, less dense fluid rises and denser fluid sinks.
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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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Which of the following sex and generation combinations directly produces the pollen tube of angiospe...
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