Describe the main differences between meiosis and mitosis.

The meiosis happens ONLY in reproductive cells: sperm and egg cell.

During the mitosis the DNA does not duplicate before the cell's division, that happens only in the meiosis.

The chromosomes, during the mitosis, put in a way along the cell's equator in a straight line. During the meiosis the chromosomes put in couples.

Mitosis results in two identical daughter cells and meiosis results in four sex cells.

Explanation:

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.