Why does the Cenozoic Era have epochs, but the Mesozoic and Paleozoic Eras do
not?

\The common use of epochs during the Cenozoic helps paleontologists better organize and group the many significant events that occurred during this comparatively short interval of time. Knowledge of this era is more detailed than any other era because of the relatively young, well-preserved rocks associated with it.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

a covalent bond, specfically triple bond