Answer - The chromosomes has to be crucially duplicated and it happens actively during the resting phase or interphase.
Reasoning - During the resting phase or interphase you call it, Is important to have the same exact DNA or Chromosomes to be duplicated. If the chromosomes did not duplicate during the interphase then the split of the cell would be unbalance and uneven and likely to cause defects.
They will be the same, because in mitosis the chromosomes are replicated exactly. In short, the chromosomes become short and thick, are then pulled apart, so you end up with two pairs of chromosomes, then cytokinesis splits the cytoplasm in to two separate ones, creating the daughter cells
Carbon dioxide is what humans exhale, giving trees carbon dioxide will produce oxygen