The stage of meiosis in which chromosomes pair and cross over is: a. prophase i b. metaphase i c. prophase ii d. metaphase ii e. anaphase ii

The answer here is Prophase 1 (A)

In the event of meiosis, Prophase 1 occurs right after Interphase (stage when DNA is replicated). In the Prophase 1 stage, chromosomes condense and pair off and then exchange DNA between each other in a manner of crossing-over homologous chromosomes.  The cross-over procedure forms a X-like region called Chiasmata that holds the homologous chromosomes intact.

Its either a) or b),wind and water erosion gradually widen the canyon

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