In prophase I of meiosis, crossing over results in

More genetic variation and chromosomes with a combination of both maternal and parental DNA.

Explanation: Crossing over is the exchange of segments of DNA from non-homologous chromosomes (non from the same parent), and creates a combination of maternal and paternal DNA, which results in more combinations of alleles in offspring.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

i believe the answer is a or 1