The geologic time scale began when Earth was formed & continues until present day. At the end of each Era a occurred and every single one of a fill in the blanks :)

simple and short because this is 8th grade science and I don't want the answer to be sus :D

First line is mass extinction and the 2nd is certain species died.

explanation:

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.