Risk-on risk-off is an investment setting in which price behavior responds to and is driven by changes in investor risk tolerance. Risk-on risk-off refers to changes in investment activity in response to global economic patterns.
Meiosis is necessary in order for sexual reproduction to occur. It ensures that when the gametes (eg. sperm and egg) combine, the new organism has the correct number of chromosomes.
Meiosis produces sex cells (sperm) , which are key in reproduction of multi-cellular organisms. Each new cell contains half of the number of chromosomes. Meiosis has 2 cellular divisions, while mitosis only has one. They are both necessary to support life, and they both produce Diploid cells in the first division.