Mitosis is used to produce daughter cells that are genetically identical to the parent cells. The cell copies - or 'replicates' - its chromosomes, and then splits the copied chromosomes equally to make sure that each daughter cell has a full set.
Mitosis is the vegetative cell division in eukaryotes. It is used to replenish the cells in tissues. It is also used in tissue regeneration and repair. Therefore, somatic cells, as well as adult stem cells, undergo mitosis.
They must have a list of biomes there. When they say which one is endangered they mean which one is likely to no longer exsist after an amount of time.