When does one diploid cell split into four haploid cells?

What are the products of respiration are? What are the benefits of the volcano Krakatau? What preserves an apple the best salt Fruit Fresh produce preserver or lemon juice? What is the difference between upward and downward delivery? How does the water cycle help to clean dirty water? Is there any difference between the intensive properties of saturated vapor at a given temperature and the vapor of standard mixture at same temperature? Are they attracted to sugar? Is the transition state the slowest step in a reaction mechanism? What type of bonding do lipids have? What experiment can you use to test if sugar is a covalent bond? What component of skin cell is responsible for blocking ultraviolet rays? Do generators provide surge protection? Grass flowers do not have strong fragrances or bright colors How might these characteristics be related to the way by which grass flowers are pollinated? How many ice-ages have you had in the history of earth? What would the seasons on earth be like if earth did not revolve around the sun but stayed in one place in relation to the sun? What test can prove that bigger organisms have bigger cells? Why wouldn't it be advisable to compare growth of the organism on each plate to each other? The parts where the coils are close together? What is the comparison between the igneous rock found near the mid-ocean ridge and the igneous rock found farther away from the mid-ocean ridge? What is a imaganery line drawn through the north and south pole?